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Why doesn’t this sed command replace the 3rd-to-last “and”? shows another interesting bug when word boundaries and group repetition are involved. This bug is seen in anything using the regexp stuff from glibc (as you would on Linux): This incorrectly matches because there is no word boundary in the middle of “cocoa”:. You can find what you want by searching for the occurrence of your pattern that does not have _another_ occurrence of that pattern after it. Suppose your pattern is P. output the occurence number in sed or grep results in every regex match: mbaste2: Linux - General: 3: 04-06-2011 01:58 AM [SOLVED] Any grep, sed or awk gurus with regex familiarity? I need some help. bcrawl: Linux - Newbie: 19: 01-19-2011 07:52 PM: Help with sed regex to match words via a pattern. logar0: Linux - Newbie: 3: 10-24-2010 04:33 PM. From the GNU sed documentation:. If no -e, -f, --expression, or --file options are given on the command-line, then the first non-option argument on the command line is taken to be the script to be executed.. Your two sed commands each has one non-option argument, which gets treated as the script. It would be better practice to always explicitly put a -e in front of the script. This means that the next character in the match will be one of the chars between the braces, in this case it's a range of possible digits between 1 and 9. We're also using the quantifier {}, it repeats the previous character match rule 5 times, so will match a 5 digit number. Note we added the -r flag to sed so that we could use regex quantifier. rgx. A basic_regex object (the pattern) to match. flags. Flags used to control how rgx is matched. One or more of these constants can be combined (using the bitwise OR operator, |) to form a valid bitmask value of type regex_constants ::match_flag_type: flag*. effects on. Logical "or" is more difficult to achieve using tools external to the regular expression engine itself, but it is achievable by combining results of multiple regular expressions using the native "or" logical feature of your programming language of choice. This can sometimes be simpler and easier for others to maintain in the future. Match lines matching the regular expression regexp. \cregexpc Match lines matching the regular expression regexp. The c may be any character. GNU sed also supports some special 2-address forms: 0,addr2 Start out in "matched first address" state, until addr2 is found. This is similar to 1,addr2, except that if addr2 matches the very first line. For every line that matches /regex/, sed appends a newline to pattern space. All the other lines that do not match /regex/ just get printed out without modification. 7. ... The only difference is how groups of three digits get matched. GNU sed has some additional patterns. There are two patterns that make this one-liner work. In this example print second line: sed '2p' / etc /passwd. The ‘p’ command is preceded by a ‘2’. The number ‘2’ refers to line number two. You can tell sed to perform prints only on a particular line or lines. In this example print 1 to 5 lines: sed '1,5p' / etc /passwd. The ‘p’ command is preceded by line rage address 1,5. Is there anyway you can do regex match group using sed like java regex pattern/match/group? if i have string like . test-artifact-201251-balbal-.1-SNAPSHOT.jar how do I use sed just to get the result like: test-artifact-.1-SNASHOT.jar I am wondering does sed allow you to do something like java regex, you define the pattern like:. <regex> is a PCRE regular expression, which can include capturing groups. <replacement> is a string to replace the regex match. Use \n for back references, where "n" is a single digit. <flags> can be either g to replace all matches, or a number to replace a specified match. The syntax for using sed to substitute characters is: "y/<string1. 1) . — Match Any Character. Let’s start simple. The dot symbol . matches any character: b.t. Above RegEx matches "bot”, "bat” and any other word of three characters which starts with b and ends in t. But if you want to search for the dot symbol, you need to escape it with \, so this RegEx will only match the exact text "b.t": b\.t. 2) .*. Match a multi-line pattern and replace with new multi-line text Replace order of two words that match a pattern Use multiple sed commands from the command-line Combine sed with other commands Insert an empty line in a file Delete all alpha-numeric characters from each line of a file. Use ‘&’ to match string Switch pair of words.

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. Answer (1 of 2): The more extensive answer to this is that regular expressions (or regex) do differ between programs. Even two programs that use the same regular expression library may or may not implement all features. Languages, editors, command line tools - all. Regular Expressions. By default, sed treats REGEXP as BRE (Basic Regular Expression) The -E option enables ERE (Extended Regular Expression) which in GNU sed's case only differs in how meta characters are used, no difference in functionalities . Initially GNU sed only had -r option to enable ERE and man sed doesn't even mention -E; Other sed versions use. How to *return* *only* the nth occurrence of a regex match using sed? Using sed to replace nth occurrence of a word. ... Let us take the example program from the below code to search for the first occurrence of that word. groups(1) The behavior of m//g in scalar context is given in the "Regexp Quote-like Operators" section of perlop (1), and in. Sed is a stream editor, this sed cheat sheet contains sed commands and some common sed tricks. ... Group using (and ). Use \1, \2 in replacement to refer the group #Sed examples #Replacing text. Replace all occurrences of a string $ sed 's/old/new/g' file.txt. Replace only the nth occurrence of a string. Use the regex command to remove results that match or do not match the specified regular expression. Use the rex command to either extract fields using regular expression named groups, or replace or substitute characters in a field using sed expressions. Replace regex. sed uses extended posix regular expressions. Read more about those here. To modify the file in place, ... [0-9]/-/g' my_file.txt Replace regex with match groups. To modify the file in place, use sed -i -r instead. In order to use the results of a match in the "search" part in the "replace" part of the sed command, use. Regex Tutorial - A Cheatsheet with Examples! Regular expressions or commonly called as Regex or Regexp is technically a string (a combination of alphabets, numbers and special characters) of text which helps in extracting information from text by matching, searching and sorting. It can also be used to replace text, regex define a search pattern. Regular expressions are used when you want to search for specific lines of text containing a particular pattern. Most of the UNIX utilities operate on ASCII files a line at a time. Regular expressions search for patterns on a single line, and not for patterns that start on one line and end on another. It is simple to search for a specific word. Deleting lines from a particular file : SED command can also be used for deleting lines from a particular file. SED command is used for performing deletion operation without even opening the file. Examples: 1. To Delete a particular line say n in this example. Syntax: $ sed 'nd' filename.txt Example: $ sed '5d' filename.txt. Regular Expression to sed replace . Character classes. any character except newline \w \d \s: word, digit, whitespace. Gets the matched pattern ( ) \1 \2 \3: Group using (and ). Use \1, \2 in replacement to refer the group # Sed examples #Replacing text. Replace all occurrences of a string ... Insert a blank line below line which matches " regex " $ sed '/ regex /G' Insert a blank line around line which matches " regex " $ sed '/ regex /{x;p;x;G;}' #Also see. You can find what you want by searching for the occurrence of your pattern that does not have _another_ occurrence of that pattern after it. Suppose your pattern is P. See the docs: regexp_extract (str, regexp [, idx]) - Extracts a group that matches regexp. The third parameter index of hive regular expression regexp_extract. Task Running Very Slowly. regexp_extract(str, pattern, idx) [source] ¶ Extract a specific group matched by a Java regex, from the specified string column. first bus timetable norwich 13. See the docs: regexp_extract (str, regexp [, idx]) - Extracts a group that matches regexp. The third parameter index of hive regular expression regexp_extract. Task Running Very Slowly. regexp_extract(str, pattern, idx) [source] ¶ Extract a specific group matched by a Java regex, from the specified string column. first bus timetable norwich 13. Basically you need to define each part that you want as a sub-expression using ellipses. Assuming the expression was matched, you'll get the matching parts in arr[1], arr[2], etc (and everything in 0, as well as some internal stuff used for RSTART, etc). Also note that match breaking it into an array like this is GNUawk-specific.

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Search: Regex Match Second Occurrence. 101838 https://dblp RE for starting with 1 having zero or multiple even 1’s It can operate on strings or bytes letter_ (letter_ I digit )* • Union operator ( I or U) has least precedence and is left associative find matches the first occurrence of the regular expression in the string find matches the first occurrence of the regular expression. Linux bash provides a lot of commands and features for Regular Expressions or regex. grep , expr , sed and awk are some of them.Bash also have =~ operator which is named as RE-match operator.In this tutorial we will look =~ operator and use cases.More information about regex command cna be found in the following tutorials. UNIX / Linux: sed Case Insensitive Search and Replace. Replacing or substituting string is simple. The below example replaces the word wiwek with vivek in the file: sed 's/wiwek/vivek/' names.txt # The g flag applies the replacement to all matches to the regexp, not just the first. # sed 's/wiwek/vivek/ g ' names.txt. REGEXP_LIKE (string expression, match_pattern, [matching parameter] ); The REGEX_LIKE function is has following options The square brackets are used to specify the matching list that should match any one of the expression In this example, [z Value” which represent using the current values of all the matches 2 Every Regular Expression Can be. Gets the matched pattern ( ) \1 \2 \3: Group using (and ). Use \1, \2 in replacement to refer the group #Sed examples #Replacing text. Replace all occurrences of a string ... Insert a blank line above line which matches "regex" $ sed '/regex/{x;p;x;}' Insert a blank line below line which matches "regex" $ sed '/regex/G'. Online regular expression tester (regex calculator) allows to perform various regular expression actions on the given text: . Highlight regexp - highlights parts of the text that matches the regular expression.; Extract regexp - extracts matching parts into a table with each regexp group as a column.; Replace regexp - replaces matching parts of the text with given string.

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Re-Match Operator in Bash. The =~ operator is known as the re-match operator. It uses the following syntax. [ [ string =~ regex ]] The re-match operator performs regular expression matching of the string on its left to the right. If the left side matches the right side, the operator returns a 0 and a 1 otherwise. For instance, the regex \b (\w+)\b\s+\1\b matches repeated words, such as regex regex, because the parentheses in (\w+) capture a word to Group 1 then the back-reference \1 tells the engine to match the characters that were captured by Group 1. Yes, capture groups and back-references are easy and fun. But when it comes to numbering and naming. Replace regex with match groups To modify the file in place, use sed -i -r instead In order to use the results of a match in the "search" part in the "replace" part of the sed command, use "\"+match_number. The s command tells sed that we are going to execute a substitution and that we will define a regex, a replacement string, and optional flags. .*year= ( [0-9]+).*month= ( [0-9]+).* Defines two capture groups. One to look for any number of contiguous digits after year= and another for any number of contiguous digits after month=. Description. Regular expressions (shortened as "regex") are special strings representing a pattern to be matched in a search operation. They are an important tool in a wide variety of computing applications, from programming languages like Java and Perl, to text processing tools like grep, sed, and the text editor vim.Below is an example of a regular. Grouping. Grouping is a way that we can logically break up our extraction. I use this for 2 main reasons: The data I want isn’t unique on its own, but the data around it is. Now I can match the unique piece and rip out what I want to use. The data I want is all there, but I plan to use pieces of it for different things. Search: Regex Match Everything Between Square Brackets. g # repeat for all the line txt) or view presentation slides online For example, [a-z0-9>_] indicates the character class containing all the lower case letters, the digits, the angle brackets, and underline this will return the value of “[brown]” which you could then use a replace statement on to remove the square. 1) . — Match Any Character. Let’s start simple. The dot symbol . matches any character: b.t. Above RegEx matches "bot”, "bat” and any other word of three characters which starts with b and ends in t. But if you want to search for the dot symbol, you need to escape it with \, so this RegEx will only match the exact text "b.t": b\.t. 2) .*. In this article, we started off with a basic introduction to grep, sed, and awk.Then, we showed the usage of grep on simple text scanning and matching. Next, we saw how sed is more useful than grep when we want to transform our text.. Finally, we’ve demonstrated how awk is capable of replicating grep and sed functionality while additionally providing more features for. If you would like to preserve a portion of the left regex, you must explicitly copy it to the right or make it a capturing group as well: echo "this is a sample id='42' string" | sed -r "s/id=' (.*?)'/\11/g" will correctly replace all of the match, id='42', with 421 since \1 is 42. Regular Expressions - sed, a stream editor char A single ordinary character matches itself. * Matches a sequence of zero or more instances of matches for the preceding regular expression, which must be an ordinary character, a special character preceded by \, a ., a grouped regexp (see below), or a bracket expression.

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Extract Directory From Path. The first part of the regex is \ (.*\)\/. () is used for capturing the match. sed matches the string and captures it. You reference the first captured match using \1; second captured match using \2; third using \3 and so on. In this example, .* is in-between () , therefore sed captures it. This means that the next character in the match will be one of the chars between the braces, in this case it's a range of possible digits between 1 and 9. We're also using the quantifier {}, it repeats the previous character match rule 5 times, so will match a 5 digit number. Note we added the -r flag to sed so that we could use regex quantifier. 2 min read. To match any text between two strings/patterns with a regular expression in Python you can use: re.search(r'pattern1 (.*?)pattern2', s).group(1) Copy. In the next sections, you’ll see how to apply the above using a simple example. In this example we are using a Kaggle dataset. sequence of characters that matched against the text. UNIX evaluates text against the pattern to determine if the text and the pattern match. If they match, the expression is true and a command is executed. Some of the most powerful UNIX utilities ,. 2 min read. To match any text between two strings/patterns with a regular expression in Python you can use: re.search(r'pattern1 (.*?)pattern2', s).group(1) Copy. In the next sections, you’ll see how to apply the above using a simple example. In this example we are using a Kaggle dataset. vim supports regex-style search with / and sed-style replacement with s.For example: /foo$ matches any line ending in "foo", and :%s/foo/bar/g replaces any occurrence of "foo" with "bar". Repeat this week's lab exercises using vim's search and replace commands. You will need to double check on the exact syntax for escaping brackets and using capturing groups, as it may. REGEXP_LIKE (string expression, match_pattern, [matching parameter] ); The REGEX_LIKE function is has following options The square brackets are used to specify the matching list that should match any one of the expression In this example, [z Value” which represent using the current values of all the matches 2 Every Regular Expression Can be. In the above example regexp has “^.*$” which matches the whole line. Replacement part <<<&>>> writes the whole line with <<< and >>> in the beginning and end of the line respectively. III. Grouping and Back-references in Sed. Grouping can be used in sed like normal regular expression. Emulating regexp lookarounds in GNU sed. 2020-10-31. This stackoverflow Q&A got me thinking about various ways to construct a solution in GNU sed if lookarounds are needed. Only single line (with newline as the line separator) processing is presented here. Equivalent lookaround syntax with grep -P or perl is also shown for comparison. There are special characters that are sued to match multiple characters, match whitespace, match digits, match letters, etc. A list of some of the more frequently used special characters are shown below: + – Almost the same behavior as * - the preceding character/group is matched 1 or more times. ? – The preceding character/group is matched. A regex processor translates a regular expression in the above syntax into an internal representation that can be executed and matched against a string representing the text being searched in. One possible approach is the Thompson's construction algorithm to construct a nondeterministic finite automaton (NFA), which is then made deterministic and the resulting. Complete Sed Command Guide [Explained with Practical Examples] In a previous article, I showed the basic usage of Sed, the stream editor, on a practical use case. Today, be prepared to gain more insight about Sed as we will take an in-depth tour of the sed execution model. This will be also an opportunity to make an exhaustive review of all Sed. The =~ binary operator provides the ability to compare a string to a POSIX extended regular expression in the shell. Take note, the right-hand side regex cannot be surrounded by quotes or it will be treated as a regular string, it cannot contain spaces, and must conform to POSIX regex rules and use character classes ... Bash: Using BASH_REMATCH to pull capture groups from a regex. 3.3 The s Command. The s command (as in substitute) is probably the most important in sed and has a lot of different options. The syntax of the s command is ‘ s/regexp/replacement/flags ’. Its basic concept is simple: the s command attempts to match the pattern space against the supplied regular expression regexp ; if the match is. Sed regex match group Grouping and Back-references in Sed Grouping can be used in sed like normal regular expression. A group is opened with "\ (" and closed with "\)".Grouping can be used in combination with back-referencing. Back-reference is the re-use of a part of a Regular Expression selected by grouping. Jun 27, 2013 · Replace regex with match groups . Delete a range of lines # May 26, 2020 · This is sub-optimal. In the output, the line with "learn" is deleted because it matches the search pattern. regex match exact string. However, this sed does not remove the lines that ... Sed Grouping and BackReference - PART-1. Linux command syntax. Linux command description. sed 's/Nick/John/g' report.txt. Replace every occurrence of Nick with John in report.txt. sed 's/Nick|nick/John/g' report.txt. Replace every occurrence of Nick or nick with John. sed 's/^/ /' file.txt >file_new.txt. Add 8 spaces to the left of a text for pretty printing. See the docs: regexp_extract (str, regexp [, idx]) - Extracts a group that matches regexp. The third parameter index of hive regular expression regexp_extract. Task Running Very Slowly. regexp_extract(str, pattern, idx) [source] ¶ Extract a specific group matched by a Java regex, from the specified string column. first bus timetable norwich 13. The "Anchors, Groups, and sed" Lesson is part of the full, Introduction to Bash, VIM & Regex course featured in this preview video. Here's what you'd learn in this lesson: To have a search pattern check at the start of the beginning of a string, James shows anchoring within Regular Expressions. Then James demonstrates capture groups, which. I want to use sed in the script to grab specific information from the temp file. The output would always have the 80 char dashed line then the information I want followed by the Disconnected statement. I've gotten a regex working if it was just a single line the trouble is how do I group the newlines as well? Regex. For every line that matches /regex/, sed appends a newline to pattern space. All the other lines that do not match /regex/ just get printed out without modification. 7. ... The only difference is how groups of three digits get matched. GNU sed has some additional patterns. There are two patterns that make this one-liner work. Sed Group Regex will sometimes glitch and take you a long time to try different solutions. LoginAsk is here to help you access Sed Group Regex quickly and handle each specific case you encounter. Furthermore, you can find the “Troubleshooting Login Issues” section which can answer your unresolved problems and equip you with a lot of relevant information. In its simplest form, when no regular expression type is given, grep. Sed Grouping and BackReference - PART-1. Grouping can be used in sed like normal regular expression. A group is opened with "\ (" and closed with "\)".Grouping can be used in combination with back-referencing. Back-reference is the re-use of a part of a Regular Expression.

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With a lazy quantifier, the engine starts out by matching as few of the tokens as the quantifier allows. For instance, with A*, the engine starts out matching zero characters, since * allows the engine to match "zero or more". But if the quantified token has matched so few characters that the rest of the pattern can not match, the engine backtracks to the quantified token and makes it. Description. Regular expressions (shortened as "regex") are special strings representing a pattern to be matched in a search operation. They are an important tool in a wide variety of computing applications, from programming languages like Java and Perl, to text processing tools like grep, sed, and the text editor vim.Below is an example of a regular. Sed will match the first string ... sed '10 q' is correct. Grouping with { and } The curly braces, "{" and "}," are used to group the commands. Hardly worth the buildup. ... Regex syntax clashes (problems with backslashes) `sed' uses the POSIX basic regular expression syntax.

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Using sed to perform inline replacements of regex groups. I love tools like sed and awk - I use them every day, and only realize how much I rely on them when I’m forced to work on a machine that’s not running Unix. Today I want to look at a feature that is really useful when working with regular expressions in sed. In this example print second line: sed '2p' / etc /passwd. The ‘p’ command is preceded by a ‘2’. The number ‘2’ refers to line number two. You can tell sed to perform prints only on a particular line or lines. In this example print 1 to 5 lines: sed '1,5p' / etc /passwd. The ‘p’ command is preceded by line rage address 1,5. Sed Regex Group will sometimes glitch and take you a long time to try different solutions. LoginAsk is here to help you access Sed Regex Group quickly and handle each specific case you encounter. Furthermore, you can find the "Troubleshooting Login Issues" section which can answer your unresolved problems and equip you with a lot of. Undefined escape sequences will be treated as the character it escapes. For example, \e will match e (not \ and e). in addition, awk gives a "not a known regexp operator" warning. The above escape sequences cannot be used inside character classes and behavior varies between the tools.. For example, using [\w] will match \ or w characters in grep and sed. sed. HW7 - More regex and sed (2 points) Due Tuesday 05/17 at 1:00 pm. No late submissions accepted. Submission: Gradescope. Specification: Spec. This assignment focuses on using regular expressions and related command sed. The set of files you will need will be on the latest main branch on the faang repository in Gitlab. Well, it can be done in sed with something called regular expression group substitutions. ... sed supports up to 9 groups that can be defined in the pattern string, and subsequently referenced in. REGEXP_LIKE (string expression, match_pattern, [matching parameter] ); The REGEX_LIKE function is has following options The square brackets are used to specify the matching list that should match any one of the expression In this example, [z Value” which represent using the current values of all the matches 2 Every Regular Expression Can be. Description. Regular expressions (shortened as "regex") are special strings representing a pattern to be matched in a search operation. They are an important tool in a wide variety of computing applications, from programming languages like Java and Perl, to text processing tools like grep, sed, and the text editor vim.Below is an example of a regular. The namespace regex_constants encapsulates several flag types and their associated flag values. Name. Description. error_type. Flags for reporting regular expression syntax errors. match_flag_type. Flags for regular expression matching options. syntax_option_type. Flags for selecting syntax options. See also. Grouping constructs delineate the subexpressions of a regular expression and capture the substrings of an input string. You can use grouping constructs to do the following: Match a subexpression that is repeated in the input string. Apply a quantifier to a subexpression that has multiple regular expression language elements. Convert sed regex to vim regex. which basically outputs the content that is between a starting point and an end point. If there are multiple occurrences of the ##1## and ##z##, then it would obviously show all the in-between text of said occurrence, like so: ##1## this is a test with multiple line ##z## ##1## this is a test with multiple line. Function Description. regexp.Match ( ) The Match ( ) takes a byte array as input and checks whether the byte array text matches the one held by regex object that called the Match ( ). If it matches, then the method returns a boolean value: true or else a boolean value: false. Sed regex match group A regular expression is a string that can be used to describe several sequences of characters. Regular expressions are used by several different Unix commands, including ed, sed, awk, grep, and to a more limited extent, vi. Here SED stands for s tream ed itor. In some versions of sed, the expression must be preceded by -e to indicate that an expression follows. The s stands for substitute, while the g stands for global, which means that all matching occurrences in the line would be replaced. The regular expression (i.e. pattern) to be searched is placed after the first delimiting symbol (slash here) and the replacement follows the second. With a lazy quantifier, the engine starts out by matching as few of the tokens as the quantifier allows. For instance, with A*, the engine starts out matching zero characters, since * allows the engine to match "zero or more". But if the quantified token has matched so few characters that the rest of the pattern can not match, the engine backtracks to the quantified token and makes it. This makes it possible to rearrange the text matched by a regular expression in many different ways. As a simple example, the regex \*(\w+)\* matches a single word between asterisks, storing the word in the first (and only) capturing group. The replacement text <b>\1</b> replaces each regex match with the text stored by the capturing group.

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YES. Capturing group. \ (regex\) Escaped parentheses group the regex between them. They capture the text matched by the regex inside them into a numbered group that can be reused with a numbered backreference. They allow you to apply regex operators to the entire grouped regex. \ (abc\){3} matches abcabcabc. Logical "or" is more difficult to achieve using tools external to the regular expression engine itself, but it is achievable by combining results of multiple regular expressions using the native "or" logical feature of your programming language of choice. This can sometimes be simpler and easier for others to maintain in the future. When attempting to build a logical “or” operation using regular expressions, we have a few approaches to follow. Fortunately the grouping and alternation facilities provided by the regex engine are very capable, but when all else fails we can just perform a second match using a separate regular expression – supported by the tool or native language of your choice. Extract Directory From Path. The first part of the regex is \ (.*\)\/. () is used for capturing the match. sed matches the string and captures it. You reference the first captured match using \1; second captured match using \2; third using \3 and so on. In this example, .* is in-between () , therefore sed captures it. Gets the matched pattern ( ) \1 \2 \3: Group using (and ). Use \1, \2 in replacement to refer the group # Sed examples #Replacing text. Replace all occurrences of a string ... Insert a blank line below line which matches " regex " $ sed '/ regex /G' Insert a blank line around line which matches " regex " $ sed '/ regex /{x;p;x;G;}' #Also see. Logical "or" is more difficult to achieve using tools external to the regular expression engine itself, but it is achievable by combining results of multiple regular expressions using the native "or" logical feature of your programming language of choice. This can sometimes be simpler and easier for others to maintain in the future. I am searching all over the place for this, just not finding anything solid. I want to do be able to access the groups that are matched with grep (either with extended regex, or perl compatible regex). For instance: Code: echo "abcd" | egrep "a (b (c (d)))" Of course this returns "abcd", but I would like to have access to each regex group that. To begin with, if you want to delete a line containing the keyword, you would run sed as shown below. sed -i '/pattern/d' file. Where option -i specifies the file in place. If you need to perform a dry run (without actually deleting the line with the keyword) and print the result to std output, omit option -i. Ansible: regex capture groups with lineinfile to preserve yaml indentation; Bash: Appending to existing values using sed capture group; Bash: grep with LookBehind and LookAhead to isolate desired text; Bash: render template from matching bash variables; Bash: while statement with ‘read’ not processing last value; Recent Posts. IV. Pattern Description : 4.1 Anchors. Suppose you want to replace all occurrences of vi with VIM.This can be easily done with. s/vi/VIM/g. If you've tried this example then you, no doubt, noticed that VIM replaced all occurrences of vi even if it's a part of the word (e.g. na vi gator). If we want to be more specific and replace only whole words vi then we need to correct our pattern. Using sed to perform inline replacements of regex groups. I love tools like sed and awk - I use them every day, and only realize how much I rely on them when I’m forced to work on a machine that’s not running Unix. Today I want to look at a feature that is really useful when working with regular expressions in sed. Replace regex. sed uses extended posix regular expressions. Read more about those here. To modify the file in place, ... [0-9]/-/g' my_file.txt Replace regex with match groups. To modify the file in place, use sed -i -r instead. In order to use the results of a match in the "search" part in the "replace" part of the sed command, use. Using sed to perform inline replacements of regex groups. I love tools like sed and awk - I use them every day, and only realize how much I rely on them when I’m forced to work on a machine that’s not running Unix. Today I want to look at a feature that is really useful when working with regular expressions in sed. See the docs: regexp_extract (str, regexp [, idx]) - Extracts a group that matches regexp. The third parameter index of hive regular expression regexp_extract. Task Running Very Slowly. regexp_extract(str, pattern, idx) [source] ¶ Extract a specific group matched by a Java regex, from the specified string column. first bus timetable norwich 13. Undefined escape sequences will be treated as the character it escapes. For example, \e will match e (not \ and e). in addition, awk gives a "not a known regexp operator" warning. The above escape sequences cannot be used inside character classes and behavior varies between the tools.. For example, using [\w] will match \ or w characters in grep and sed. s/ The beginning of a search and replace command. \ (.*\)\n Match the whole line, but only save the part without the newline. '\1', Replace line with the match surrounded by single quotes and append a comma. 2nd line (Surround in brackets) \ (.*\), Match the whole line but not the last comma and space. regex - Use sed to replace a group match - Stack Overflow Use sed to replace a group match Ask Question 1 I have a simple regular expression that creates a group match for any semicolon contained within double quotes. I'm trying to use sed on Mac OS X to replace the semicolon with 'SEMICOLON'. However, it's not working. Here's the command I used:. The namespace regex_constants encapsulates several flag types and their associated flag values. Name. Description. error_type. Flags for reporting regular expression syntax errors. match_flag_type. Flags for regular expression matching options. syntax_option_type. Flags for selecting syntax options. Sed regex match group Grouping and Back-references in Sed Grouping can be used in sed like normal regular expression. A group is opened with "\ (" and closed with "\)".Grouping can be used in combination with back-referencing. Back-reference is the re-use of a part of a Regular Expression selected by grouping.

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Method 1: grep for first and last character. Method 2: Match text with white space characters. Method 3: Match beginning and end of word. Method 4: Match with numbers in the string. Conclusion. How do I grep for an exact match for string or pattern from a file in Linux or Unix. How to search for exact pattern. What happened is this; our first selection group captured the text abcdefghijklmno.Then, given the .* (any character, 0 or more times) all characters were matched – and this important; to the maximum extent – until we find the next applicable matching regular expression, if any.Then, finally, we matched any letter out of the A-Z range, and this one more. Regular expressions are built into tools including grep and sed, text editors including vi and emacs, programming languages including Go, Java, and Python. Go has built-in API for working with regular expressions; it is located in regexp package. A regular expression defines a search pattern for strings. It is used to match text, replace text. sed non greedy grouping match. Hello everyone, I've tried different variations of sed but cannot get it to stop the matching of the group at the first occurrence of the delimiter which is the comma. Let's say I have like 1K+ lines with the below log:.

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1) . — Match Any Character. Let’s start simple. The dot symbol . matches any character: b.t. Above RegEx matches "bot”, "bat” and any other word of three characters which starts with b and ends in t. But if you want to search for the dot symbol, you need to escape it with \, so this RegEx will only match the exact text "b.t": b\.t. 2) .*. In this example, we use the '&' character in the replacement string, which tells sed to insert the entire matched regular expression. So, whatever was matched by '.*' (the largest group of zero or more characters on the line, or the entire line) can be inserted anywhere in the replacement string, even multiple times. If we want the separators to match, we can use a capture group and a back reference. The back reference will look at the match found in the indicated capture group, and ensure that the location of the back reference matches exactly. The \1 denotes the first capture group in the pattern. With this small change, the regex now matches 1-a-4 or 1 a. Reverse sed's/regexes' pattern-matching priority order. echo "string.with.dots" | sed 's/\ (.*\)\.\ (.*\)/\1\n\2/'. (Matches into a first capturing group any character until the last . and into a second capturing group any character after it.) Reasonably (I think) I tought that using anchors in the right combination would have managed to. Search: Regex Match Everything Between Square Brackets. g # repeat for all the line txt) or view presentation slides online For example, [a-z0-9>_] indicates the character class containing all the lower case letters, the digits, the angle brackets, and underline this will return the value of “[brown]” which you could then use a replace statement on to remove the square. This matches either color, then looks further in the file for a dictionary entry of the form :original=translation, capturing the translation to Group 2.Our replacement is therefore \2 (here's a demo). Of course if there's a chance that the actual text would contain segments that look like dictionary entries, the regex would have to be refined. Replace regex with match groups To modify the file in place, use sed -i -r instead In order to use the results of a match in the "search" part in the "replace" part of the sed command, use "\"+match_number. hello, I am writting a regular expression that intend to match any tunnel or serial interface but it doesn't mtach any serial sub-interface. For example, statement should match "Tunnel3" or "Serial0/1" but shouldn't match "Serial0\1.1" (doesn't include dot ".") ... I can write a match for sed to replace the link with anything. For example: http. * These bitmask flag names are available under the std::regex_constants namespace (see regex_constants for more details). ** Constants with a value of zero are ignored if some other flag is set. match_flag_type is a type available under the std::regex_constants namespace. out Output iterator pointing to the first character of a sequence where the resulting sequence is stored. Regex Tutorial - A Cheatsheet with Examples! Regular expressions or commonly called as Regex or Regexp is technically a string (a combination of alphabets, numbers and special characters) of text which helps in extracting information from text by matching, searching and sorting. It can also be used to replace text, regex define a search pattern. Replace regex with match groups. To modify the file in place, use sed -i -r instead. In order to use the results of a match in the "search" part in the "replace" part of the sed command, use "\"+match_number. For example, to add a 'X' to the end of all numbers in a file:. 21, 2. sed REGEX to print multiple occurrences of a pattern from a line. I have a line that I need to parse through and extract a pattern that occurs multiple times in it. Example line: Code: getInfoCall: [ call=1 origin=AAAA ] info received please proceed, getInfoCall: [ call=3 origin=BBBB ] info received please proceed, getInfoCall: [ call=5. Well, it can be done in sed with something called regular expression group substitutions. ... sed supports up to 9 groups that can be defined in the pattern string, and subsequently referenced in. /regexp/ Match lines matching the regular expression regexp. Matching is performed on the current pattern space, which can be modified with commands such as ``s///''. \cregexpc Match lines matching the regular expression regexp. The c may be any character. GNU sed also supports some special 2-address forms: 0,addr2 Start out in "matched first. The "Anchors, Groups, and sed" Lesson is part of the full, Introduction to Bash, VIM & Regex course featured in this preview video. Here's what you'd learn in this lesson: To have a search pattern check at the start of the beginning of a string, James shows anchoring within Regular Expressions. Then James demonstrates capture groups, which. The below regular expression has two groups ([^ ]) (.*) where: the first group is [^ ] which will parse all non space characters. the second group is .* which will take all characters. if you parse the following text: Hello World. You will get: in the first group, \1, the text Hello. hello, I am writting a regular expression that intend to match any tunnel or serial interface but it doesn't mtach any serial sub-interface. For example, statement should match "Tunnel3" or "Serial0/1" but shouldn't match "Serial0\1.1" (doesn't include dot ".") ... I can write a match for sed to replace the link with anything. For example: http.

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sequence of characters that matched against the text. UNIX evaluates text against the pattern to determine if the text and the pattern match. If they match, the expression is true and a command is executed. Some of the most powerful UNIX utilities ,. Is there anyway you can do regex match group using sed like java regex pattern/match/group? if i have string like . test-artifact-201251-balbal-0.1-SNAPSHOT.jar how do I use sed just to get the result like: test-artifact-0.1-SNASHOT.jar I am wondering does sed allow you to do something like java regex, you define the pattern like:. Sed Replace Regex Group LoginAsk is here to help you access Sed Replace Regex Group quickly and handle each specific case you encounter. Furthermore, you can find the “Troubleshooting Login Issues” section which can answer your unresolved problems and equip you with a lot of relevant information. Search: Regex Match Everything Between Square Brackets. g # repeat for all the line txt) or view presentation slides online For example, [a-z0-9>_] indicates the character class containing all the lower case letters, the digits, the angle brackets, and underline this will return the value of “[brown]” which you could then use a replace statement on to remove the square. Sed regex match group Grouping and Back-references in Sed Grouping can be used in sed like normal regular expression. A group is opened with "\ (" and closed with "\)".Grouping can be used in combination with back-referencing. Back-reference is the re-use of a part of a Regular Expression selected by grouping. Sed is a stream editor, this sed cheat sheet contains sed commands and some common sed tricks. ... Group using (and ). Use \1, \2 in replacement to refer the group #Sed examples #Replacing text. Replace all occurrences of a string $ sed 's/old/new/g' file.txt. Replace only the nth occurrence of a string. For every line that matches /regex/, sed appends a newline to pattern space. All the other lines that do not match /regex/ just get printed out without modification. 7. ... The only difference is how groups of three digits get matched. GNU sed has some additional patterns. There are two patterns that make this one-liner work. In the replacement string we’re referencing the first (and only) group with \1, followed by 234 which is the replacement for the rest of. The regex might look something like: const literalRegex = /\ ( [^ ()]+\)/g. Then using an excerpt of Lorem Ipsum with parentheses plugged into 3 places, we can test our regex with the .match () method and retrieve all of the parenthetical test phrases used: const book = "Lorem ipsum dolor sit amet, consectetur adipiscing elit. The s command tells sed that we are going to execute a substitution and that we will define a regex, a replacement string, and optional flags. .*year= ( [0-9]+).*month= ( [0-9]+).* Defines two capture groups. One to look for any number of contiguous digits after year= and another for any number of contiguous digits after month=. You can find what you want by searching for the occurrence of your pattern that does not have _another_ occurrence of that pattern after it. Suppose your pattern is P. Emulating regexp lookarounds in GNU sed. 2020-10-31. This stackoverflow Q&A got me thinking about various ways to construct a solution in GNU sed if lookarounds are needed. Only single line (with newline as the line separator) processing is presented here. Equivalent lookaround syntax with grep -P or perl is also shown for comparison. YES. Capturing group. \ (regex\) Escaped parentheses group the regex between them. They capture the text matched by the regex inside them into a numbered group that can be reused with a numbered backreference. They allow you to apply regex operators to the entire grouped regex. \ (abc\){3} matches abcabcabc. Match every step'th line starting with line first. For example, ''sed -n 1~2p'' will print all the odd-numbered lines in the input stream, and the address 2~5 will match every fifth line, starting with the second. first can be zero; in this case, sed operates as if it were equal to step. (This is an extension.) $ Match the last line. /regexp/. In this example, we use the '&' character in the replacement string, which tells sed to insert the entire matched regular expression. So, whatever was matched by '.*' (the largest group of zero or more characters on the line, or the entire line) can be inserted anywhere in the replacement string, even multiple times. Replace regex. sed uses extended posix regular expressions. Read more about those here. To modify the file in place, ... [0-9]/-/g' my_file.txt Replace regex with match groups. To modify the file in place, use sed -i -r instead. In order to use the results of a match in the "search" part in the "replace" part of the sed command, use. From the GNU sed documentation:. If no -e, -f, --expression, or --file options are given on the command-line, then the first non-option argument on the command line is taken to be the script to be executed.. Your two sed commands each has one non-option argument, which gets treated as the script. It would be better practice to always explicitly put a -e in front of the script. Returns whether the target sequence matches the regular expression rgx.The target sequence is either s or the character sequence between first and last, depending on the version used. The versions 4, 5 and 6, are identical to 1, 2 and 3 respectively , except that they take an object of a match_results type as argument, which is filled with information about the match results.

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How to use sed to match word and perform find and replace In this example only find word ‘love’ and replace it with ‘sick’ if line content a specific string such as FOO: $ sed -i -e '/FOO/s/love/sick/' input.txt. Sed Group Regex will sometimes glitch and take you a long time to try different solutions. LoginAsk is here to help you access Sed Group Regex quickly and handle each specific case you encounter. Furthermore, you can find the “Troubleshooting Login Issues” section which can answer your unresolved problems and equip you with a lot of relevant information. Why doesn’t this sed command replace the 3rd-to-last “and”? shows another interesting bug when word boundaries and group repetition are involved. This bug is seen in anything using the regexp stuff from glibc (as you would on Linux): This incorrectly matches because there is no word boundary in the middle of “cocoa”:. This method checks whether the regular expression matches the pattern or not. boolean find() This method searches the occurrences of regex in a string. boolean find(int start) This method searches the occurrences of regex in a string from the starting index. String group() This method helps in finding the matched subsequence. int start(). The regex might look something like: const literalRegex = /\ ( [^ ()]+\)/g. Then using an excerpt of Lorem Ipsum with parentheses plugged into 3 places, we can test our regex with the .match () method and retrieve all of the parenthetical test phrases used: const book = "Lorem ipsum dolor sit amet, consectetur adipiscing elit. How to use sed to match word and perform find and replace In this example only find word ‘love’ and replace it with ‘sick’ if line content a specific string such as FOO: $ sed -i -e '/FOO/s/love/sick/' input.txt. A group is a section of a regular expression enclosed in parentheses (). This is commonly called "sub-expression" and serves two purposes: It makes the sub-expression atomic, i.e. it will either match, fail or repeat as a whole. The portion of text it matched is accessible in the remainder of the expression and the rest of the program. Groups. Complete Sed Command Guide [Explained with Practical Examples] In a previous article, I showed the basic usage of Sed, the stream editor, on a practical use case. Today, be prepared to gain more insight about Sed as we will take an in-depth tour of the sed execution model. This will be also an opportunity to make an exhaustive review of all Sed. . In some versions of sed, the expression must be preceded by -e to indicate that an expression follows. The s stands for substitute, while the g stands for global, which means that all matching occurrences in the line would be replaced. The regular expression (i.e. pattern) to be searched is placed after the first delimiting symbol (slash here) and the replacement follows the second.

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Linux command syntax. Linux command description. sed 's/Nick/John/g' report.txt. Replace every occurrence of Nick with John in report.txt. sed 's/Nick|nick/John/g' report.txt. Replace every occurrence of Nick or nick with John. sed 's/^/ /' file.txt >file_new.txt. Add 8 spaces to the left of a text for pretty printing. REGEXP_LIKE (string expression, match_pattern, [matching parameter] ); The REGEX_LIKE function is has following options The square brackets are used to specify the matching list that should match any one of the expression In this example, [z Value” which represent using the current values of all the matches 2 Every Regular Expression Can be. The Python "re" module provides regular expression support. In Python a regular expression search is typically written as: match = re.search(pat, str) The re.search () method takes a regular expression pattern and a string and searches for that pattern within the string. If the search is successful, search () returns a match object or None. s/ The beginning of a search and replace command. \ (.*\)\n Match the whole line, but only save the part without the newline. '\1', Replace line with the match surrounded by single quotes and append a comma. 2nd line (Surround in brackets) \ (.*\), Match the whole line but not the last comma and space. 5.7 Back-references and Subexpressions. back-references are regular expression commands which refer to a previous part of the matched regular expression. Back-references are specified with backslash and a single digit (e.g. '\1').The part of the regular expression they refer to is called a subexpression, and is designated with parentheses. Back-references and subexpressions are used in two. You can find what you want by searching for the occurrence of your pattern that does not have _another_ occurrence of that pattern after it. Suppose your pattern is P.

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In this article, we started off with a basic introduction to grep, sed, and awk.Then, we showed the usage of grep on simple text scanning and matching. Next, we saw how sed is more useful than grep when we want to transform our text.. Finally, we’ve demonstrated how awk is capable of replicating grep and sed functionality while additionally providing more features for. The regex might look something like: const literalRegex = /\ ( [^ ()]+\)/g. Then using an excerpt of Lorem Ipsum with parentheses plugged into 3 places, we can test our regex with the .match () method and retrieve all of the parenthetical test phrases used: const book = "Lorem ipsum dolor sit amet, consectetur adipiscing elit. A regex pattern uses a regular expression engine that translates those patterns. Linux has two regular expression engines: The Basic Regular Expression (BRE) engine. The Extended Regular Expression (ERE) engine. Most Linux programs work well with BRE engine specifications, but some tools like sed understand some of the BRE engine rules. Hi, I have a large csv file that I'm using sed to remove double quotes except if followed by a comma. For example, if I have: "4" x 4"","4", I would. This is a little hacky and doesn't generalise well. The problem with this approach is that the pattern [^0-9]*([0-9]+)[^0-9]* needs to be designed in such a way that it never crosses the boundary of another match. That works OK for this example, but for complex search queries that don't work on a character-by-character basis, it isn't very practical to have to surround the. The following “sed” command shows how a new line can be added anywhere in the file based on the matching pattern. The pattern used in the “sed” command will search any line starting with “s01”, and add the new string after it. The fourth line of the file starts with “s01”, and the new line will be inserted after that line. const csLewisQuote = 'We are what we believe we are.'; const regex = /are/; csLewisQuote.match(regex); // ["are", index: 3, input: "We are what we believe we are.", groups: undefined] In this case, we .match() an array with the first match along with the index of the match in the original string, the original string itself, and any matching groups that were used. First of all the regex engine will start searching for an a in the string from left to right. When it matches an a, which is after is in the sentence then the positive lookahead process starts. After matching a the engine enters the positive lookahead and it notes that now it is going to match a positive lookahead. I have a line as follows in squid.conf file. My sever is hosted in a cloud: acl verizonfios src 1.2.3.4 My ISP will force an IP address change every week or two. I would like to replace them with a new IP acl verizonfios src 4.5.6.7 How do I replace the line starting with "acl verizonfios" with new IP address using sed and ssh?. Groups the inner regexp as a whole; this is used to: Apply postfix operators, like \(abcd\)*: this searches for zero or more whole sequences of ... The I modifier to regular-expression matching is a GNU extension which makes sed match regexp in a. Search: Regex Match Everything Between Square Brackets. g # repeat for all the line txt) or view presentation slides online For example, [a-z0-9>_] indicates the character class containing all the lower case letters, the digits, the angle brackets, and underline this will return the value of “[brown]” which you could then use a replace statement on to remove the square. A regex pattern uses a regular expression engine that translates those patterns. Linux has two regular expression engines: The Basic Regular Expression (BRE) engine. The Extended Regular Expression (ERE) engine. Most Linux programs work well with BRE engine specifications, but some tools like sed understand some of the BRE engine rules. The first capture group is stored in index 1, the second (if any) in index 2, etc. Index zero is the full match. You should be aware that without anchors, this regex (and the one using grep) will match any of the following examples and more, which may not be what you're looking ... so I'd argue that grep + sed etc is a more Unixy way of doing. The 2nd capture group collects the characters between the space and the newline. This allows for any number of names/initials prior to lastname, provided lastname is at the end of the line. Repl: \2, \1\n — insert 2nd capture (lastname) in front of first capture (all preceding names/initials) Reverse the conversion. That is, it tells the regex engine to match either everything to the left of the vertical bar, or everything to the right of the vertical bar. If you want to limit the reach of the alternation, you need to use parentheses for grouping. If we want to improve the first example to match whole words only, we would need to use \b (cat | dog) \b. The difference is that the repeated capturing group will capture only the last iteration, while a group capturing another group that's repeated will capture all iterations. An example will make this clear. Let's say you want to match a tag like !abc! or !123!. Only these two are possible, and you want to capture the abc or 123 to figure out. Search: Regex Match Second Occurrence. 101838 https://dblp RE for starting with 1 having zero or multiple even 1’s It can operate on strings or bytes letter_ (letter_ I digit )* • Union operator ( I or U) has least precedence and is left associative find matches the first occurrence of the regular expression in the string find matches the first occurrence of the regular expression. See also. Substitutions are language elements that are recognized only within replacement patterns. They use a regular expression pattern to define all or part of the text that is to replace matched text in the input string. The replacement pattern can consist of one or more substitutions along with literal characters. 1) . — Match Any Character. Let’s start simple. The dot symbol . matches any character: b.t. Above RegEx matches "bot”, "bat” and any other word of three characters which starts with b and ends in t. But if you want to search for the dot symbol, you need to escape it with \, so this RegEx will only match the exact text "b.t": b\.t. 2) .*. You might see the problem the other way round and try to match the part you want to keep: sed 's:.*\(=.*$\):\1:' everyone.pls i.e. match everything but surround the part you are interested in in brackets then you add the first group back with \1. Insert a space between lowercase/Uppercase characters using & (which represents the regex match) sed 's/[a-zA-Z]/& /g' file.txt . Keep the first word of every line (where word is defined by alphanumeric chars + underscores for simplicity sake) ... \1 to \9 are the groups id's. You use a group like `sed -E 's/(foo) (bar)/\2 \1' file.txt '. In. Search: Regex Match Second Occurrence. 101838 https://dblp RE for starting with 1 having zero or multiple even 1’s It can operate on strings or bytes letter_ (letter_ I digit )* • Union operator ( I or U) has least precedence and is left associative find matches the first occurrence of the regular expression in the string find matches the first occurrence of the regular expression. Un virus letal se expande por Corea del Sur, provocando violentos altercados. Los pasajeros de un tren KTX que viaja de Seúl a Busan tendrán que luchar por su supervivencia. 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sed non greedy grouping match. Hello everyone, I've tried different variations of sed but cannot get it to stop the matching of the group at the first occurrence of the delimiter which is the comma. Let's say I have like 1K+ lines with the below log:. Appendix A Extended regular expressions. The only difference between basic and extended regular expressions is in the behavior of a few characters: ‘? ’, ‘ + ’, parentheses, and braces (‘ {} ’). While basic regular expressions require these to be escaped if you want them to behave as special characters, when using extended regular. sed non greedy grouping match. Hello everyone, I've tried different variations of sed but cannot get it to stop the matching of the group at the first occurrence of the delimiter which is the comma. Let's say I have like 1K+ lines with the below log:. Regular Expressions - sed, a stream editor char A single ordinary character matches itself. * Matches a sequence of zero or more instances of matches for the preceding regular expression, which must be an ordinary character, a special character preceded by \, a ., a grouped regexp (see below), or a bracket expression.

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Enable less experienced developers to create regex smoothly. This site uses cookies to improve your user experience. Reject Accept. Regex Generator. Creating regular ... By default, all major regex engines match in case-sensitive mode. If you want patterns such as
You can find what you want by searching for the occurrence of your pattern that does not have _another_ occurrence of that pattern after it. Suppose your pattern is P.
See also. Substitutions are language elements that are recognized only within replacement patterns. They use a regular expression pattern to define all or part of the text that is to replace matched text in the input string. The replacement pattern can consist of one or more substitutions along with literal characters.
The first capture group is stored in index 1, the second (if any) in index 2, etc. Index zero is the full match. You should be aware that without anchors, this regex (and the one using grep) will match any of the following examples and more, which may not be what you're looking ... so I'd argue that grep + sed etc is a more Unixy way of doing ...