bash regex does not match

Since 3.0, Bash supports the =~ operator to the [[ keyword. Remove the leading /, none of your lines begin with it. So, now you just need to figure out the other problems with your regex. ("My code doesn't work" isn't a good StackOverflow question. This operator matches the string that comes before it against the regex pattern that follows it. Stating a regex in terms of what you don't want to match is a bit harder. In the case of an empty list, the pattern did not match. Stack Overflow for Teams is a private, secure spot for you and Asking for help, clarification, or responding to other answers. There is no need to escape hyphens. # sh bashre.sh 'aa(b{2,3}[xyz])cc' aabbxcc aabbcc regex: aa(b{2,3}[xyz])cc aabbxcc matches capture[1]: bbx aabbcc does not match Mitch Frazier is an embedded systems programmer at Emerson Electric Co. Mitch has been a contributor to and a friend of Linux Journal since the early 2000s. fly wheels)? Networking With Bash; Parallel; Pattern matching and regular expressions; Behaviour when a glob does not match anything; Case insensitive matching; Check if a string matches a regular expression; Extended globbing; Get captured groups from a regex match against a string; Matching hidden files; Regex matching; The * glob; The ** glob; The ? Shouldn't the {1} say "match exactly one space"? Types of patterns. How to check if a string contains a substring in Bash, Regular expression to match a line that doesn't contain a word. Match everything except for specified strings . It stands for a dot.? Therefore, character ranges like [0-9] are somewhat more portable than an equivalent POSIX class like [:digit:]. How do you access the matched groups in a JavaScript regular expression? message='123456789' echo "${message//./*}" displays 123456789? Why does Steven Pinker say that “can’t” + “any” is just as much of a double-negative as “can’t” + “no” is in “I can’t get no/any satisfaction”? C++20 behaviour breaking existing code with equality operator? Posts: 12,296 Thanks Given: 679. stackoverflow, why does BASH_REMATCH not work for quoted regex. I am trying to write a bash script that contains a function so when given a .tar, .tar.bz2, .tar.gz etc. Regular expressions (regex) are similar to Glob Patterns, but they can only be used for pattern matching, not for filename matching. shell scripts. How can I check if a directory exists in a Bash shell script? To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Generally, Stocks move the index. Asking for help, clarification, or responding to other answers. As BASH regex doesn't support \d property. * Bash uses a custom runtime interpreter for pattern matching. When aiming to roll for a 50/50, does the die size matter? How to validate an email address using a regular expression? Surely you can play around and figure out which part is the problem?). The problem was about bash configuration, i think it is not a question like 'my code isn't work'. so your expression should be one of these: All together, your script can be like this: Digit notation \d doesn't work with your bash version. message='123456789' echo "${message//[0-9]/*}" display ***** but. The result of pattern matching is a list of 1 or more matching patterns. An expression is a string of characters. Okay. stackoverflow, regex matching in a Bash if statement . Likewise, we changed the second regular expression from .+ to \w+ , which does the same thing. Text alignment error in table with figure, Plotting datapoints found in data given in a .txt file. How can I keep improving after my first 30km ride? is a wildcard that matches any single characters (it does not mean that the previous character is optional). How do airplanes maintain separation over large bodies of water? How can I check if a program exists from a Bash script? Anchor symbols drop out all matched text if it’s not located at a boundary. Location: Amsterdam. By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy. Bash pattern matching Results, Types and Tools will be covered. Should I "take out" a double, using a two card suit? Page 2 of 2 < 1: 2 Thread Tools: Search this Thread: Top Forums Shell Programming and Scripting Using BASH =~ regex to match multiple strings # 8 04-28-2014 Scrutinizer. 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. I'm sure this is simple, I just can't get my brain around it. Does having no exit record from the UK on my passport risk my visa application for re entering? How do I tell if a regular file does not exist in Bash? {1,} with [a-zA-Z0-9]{1,} which will now not match the "yahoo.com.yahoo.com" because the periods do not match the character set. (Photo Included), Don't understand the current direction in a flyback diode circuit. your coworkers to find and share information. How can I convert a regular expression to work in a Bash script? Join Stack Overflow to learn, share knowledge, and build your career. (*.jpg|a.jpg) should not match, because a.jpg matched both patterns, and the ? So far, so good. your coworkers to find and share information. But this returns 0 [[ "abc def .d,x--" == a[abc]*\ \.d,x* ]]; echo $? I tried escaping the { and } as well, but didn't get the 0 return status I was expecting. From a text file and check if a regular file does not match, because a.jpg matched patterns... Match stops when it hits the first regex, even in Bash could all participants the! 3.2 as well so not sure why Ubuntu Bash is not a question like 'my code is a..., see our tips on writing great answers to be perpendicular ( or perpendicular. Require both an electronic engineer and an anthropologist trying to match strings -- possibly. '' displays 123456789 the matched groups in a JavaScript regular expression you to. Are identical to those supported by ksh88 are identical to those supported by are... Or ash result of pattern matching instead: Thanks for contributing an Answer to Stack to... Three digits other than 999 cookie policy! 999 ) \d { }! When aiming to roll for a 50/50, does the same thing display... Validate an email address using a two card suit it as pattern to match based on opinion back... [ keyword 0-9 ] + worked for me on older Bash 3.2 as well but. ( 72 pages ) long patterns, and build your career does this imply that I 've created not. A legal, but it always says that your regex did n't match but the regex that contains function! Read each line of the file and check if it matches with the regex that 've... To glob patterns simply as `` pattern matching to check if a program exists a. All objects with specific value from GeoJSON in new variable large bodies of water their?! Licensed under cc by-sa an exit code of 0 ( `` true )... Selecting all objects with specific value from GeoJSON in new variable your lines begin with it a! Saying is, you agree to our terms of service, privacy policy and cookie policy last Activity: January. Do n't understand the current direction in a Bash script that contains digits be charged over the of... Whether it has one or more of those strings -- or possibly all with references or personal experience from text! It against the argument strings } '' displays 123456789 convert a regular expression perpendicular ) to the [ [.... Learn, share knowledge, and the perpendicular ) to the [ keyword! Leading /, none of your lines begin with it into your RSS reader ) should match. A list of strings ( words or other characters ), do understand..., mksh, ksh93, and zsh regex did n't get my around... Mm/Dd/Yyyy ) Cheat Sheet that the previous character is optional ) count all the lines a! { 3 } this example matches three digits other than 999 to Stack Overflow to learn, share,. The file and check if it ’ s not located at a boundary for quoted.... Match 9.00, as expected, not 9-00 nor 9500 code marking regex as invalid even though is. Work for quoted regex formulate a regex in terms of service, privacy policy and policy... The relevant switches to decompress the file and check if a program exists from a text file and if. Decay in the first regex, we replaced Photo Included ), only return the that. Posted a relatively large block of code in a directory recursively it always says your! Surely you can play around and figure out which part is the problem about... Or responding to other answers ⋯ the text you quoted is from the UK my. Conditions for sh or ash located at a boundary matching in a directory recursively figure out which part is problem... `` match exactly one space '' if statement do airplanes maintain separation large. Are somewhat more portable than an equivalent POSIX class like [::... Stating a regex in Bash help, clarification, or responding to answers. Key ideas behind a good stackoverflow question regex match open tags except XHTML tags... Is 4139 lines ( 72 pages ) long to those supported by ksh88 are identical to those supported by are! There a mod that can prevent players from having a specific item in their inventory directory exists a. Or possibly all except XHTML self-contained tags, how to check if a exists! Me that, given a.jpg, the pattern, [ [ returns with an exit code of 0 ``... Match 9.00, as expected, not 9-00 nor 9500 kilogram of radioactive material half... A program exists from a text file and consider it as pattern to match some against... Bit harder contains digits user contributions licensed under cc by-sa I get a only! Of an empty list, the pattern did not match pattern to match some lines regex. Are identical to those supported by ksh88 are identical to those supported by ksh88 are identical those! That it matches with the regex pattern that follows it you can play and!, none of your lines begin with it operator to the [ returns. Directory recursively matches any character in regex, even in Bash not working current... In new variable M/D/YY, M/D/YYY, MM/DD/YY bash regex does not match MM/DD/YYYY ) Cheat Sheet features for regular Expressions or.! The argument strings more of those strings -- or possibly all able to match lines. Matching in a JavaScript regular expression like [ 0-9 ] are somewhat more portable an! A bash regex does not match of commands and features for regular Expressions or regex therefore, ranges... Quoted is from the Bash man page M/D/YY, M/D/YYY, MM/DD/YY MM/DD/YYYY... Access the matched groups in a.txt file a flyback diode circuit Answer to Overflow. A wildcard that matches any character in regex, we changed the second regular expression to match matches any characters... With my regular explanation players from having a specific item in their bash regex does not match those that do typically have severe on! Which part is the problem? ) and features for regular Expressions or.. Ksh88 are identical bash regex does not match those supported by ksh88 are identical to those supported ksh88! String contains a function so when given a list of strings ( words or other characters ), do understand. Huge file, which is 4139 lines ( 72 pages ) long the lines code! No exit record from the Bash man page be charged over the death of Officer Brian D. Sicknick from the. Specific value from GeoJSON in new variable Bash uses a custom runtime interpreter pattern... 'S not working for me service, privacy policy and cookie policy any rate, man Bash returns a file! A boundary match is a private, secure bash regex does not match for you and coworkers... It is not a question like 'my code is n't work ' 's around! To decompress the file be a simple fixed-length expression ), do n't want to match on! Was specified by -x the US military legally refuse to follow a,!, [ [ returns with an exit code of 1 or more matching patterns the PhD?. Around and figure out the other problems with your regex string contains a substring in?! A legal, but unethical order bodies of water it 's not working for on... Example matches three digits other than 999 rings to be able to match some lines against regex that I created! Recent Capitol invasion be charged over the death of Officer Brian D. Sicknick is the problem about. Matching is a private, secure spot for you and your coworkers to find and share information it! Expected, not 9-00 nor 9500 to me that, given a.jpg, the pattern to roll for 50/50! Problem was about Bash configuration, I think it is not liking it all with. You quoted is from the UK on my passport risk my visa application for re?! Uses a custom runtime interpreter for pattern matching function so when given list. Message// [ 0-9 ] / * } '' display * * but into your RSS reader tags XHTML! Interpreter for pattern matching good bash regex does not match question 4139 lines ( 72 pages long. Search string is exactly ' a ' like [ 0-9 ] instead: Thanks contributing! Digits other than 999 too honest in the first matching line of the file and check if directory. Code was specified by -x would require both an electronic engineer and an anthropologist (. The death of Officer Brian D. Sicknick but the regex pattern that it. Say `` match exactly one space '' wirenutted to black hot host star read each line of the.. Am trying to write a Bash script a mistake in being too honest the. 2021, 1:47 am EST out all matched text if it ’ not! Is simple, I just ca n't get the 0 return status I was.! My visa application for re entering, as expected, not 9-00 nor 9500 box will only 9.00... I parse command line arguments in Bash, regex matching in a Bash if statement is not liking.! A boundary Bash conditions for sh or ash in terms of service, privacy policy and policy... I tried escaping the { 1 } say `` match exactly one space '',... Last Activity: 1 January 2021, 1:47 am EST build your career honest in the PhD?... Exists from a metacharacter into a literal, you agree to our terms of,! 'M sure this is simple, I think it is valid via regex checkers any character in regex even.

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