Regular Expressions 101

Save & Share

  • Regex Version: ver. 10
  • Update Regex
    ctrl+⇧+s
  • Save new Regex
    ctrl+s
  • Add to Community Library

Flavor

  • PCRE2 (PHP >=7.3)
  • PCRE (PHP <7.3)
  • ECMAScript (JavaScript)
  • Python
  • Golang
  • Java 8
  • .NET 7.0 (C#)
  • Rust
  • Regex Flavor Guide

Function

  • Match
  • Substitution
  • List
  • Unit Tests

Tools

Sponsors
There are currently no sponsors. Become a sponsor today!
An explanation of your regex will be automatically generated as you type.
Detailed match information will be displayed here automatically.
  • All Tokens
  • Common Tokens
  • General Tokens
  • Anchors
  • Meta Sequences
  • Quantifiers
  • Group Constructs
  • Character Classes
  • Flags/Modifiers
  • Substitution
  • A single character of: a, b or c
    [abc]
  • A character except: a, b or c
    [^abc]
  • A character in the range: a-z
    [a-z]
  • A character not in the range: a-z
    [^a-z]
  • A character in the range: a-z or A-Z
    [a-zA-Z]
  • Any single character
    .
  • Alternate - match either a or b
    a|b
  • Any whitespace character
    \s
  • Any non-whitespace character
    \S
  • Any digit
    \d
  • Any non-digit
    \D
  • Any word character
    \w
  • Any non-word character
    \W
  • Non-capturing group
    (?:...)
  • Capturing group
    (...)
  • Zero or one of a
    a?
  • Zero or more of a
    a*
  • One or more of a
    a+
  • Exactly 3 of a
    a{3}
  • 3 or more of a
    a{3,}
  • Between 3 and 6 of a
    a{3,6}
  • Start of string
    ^
  • End of string
    $
  • A word boundary
    \b
  • Non-word boundary
    \B

Regular Expression
No Match

/
/
gm

Test String

Code Generator

Language

Generated Code

use strict; my $str = '### Should Pass Test NV-1234 chore: change build progress DT-123456 docs: update xdemo usage QA-123 ci: update jenkins automatic backup CC-1234 feat: new fucntional about sync Merge branch master into develop Reverted: Revert "support UV113 feature & bugfix branches make full build Merge pull request #36 in cicd from test to developSquashed commit of the following: com ### Failed to match test NV-1234 build: update NV-1234 Chore: change progress DT-123456 Docs: update xdemo QA-123ci: update jenkins automatic backup CC-1234 Feat: new fucntional about sync DT-17734: 8.2.2 merge from CF1/2- Enhance PORT.STATUS to identify Python processes initiated DT-17636 fix AIX cord dump issue DT-18183 Fix the UDTHOME problem for secure telnet DT-18183 Add new condition to get UDTHOME DT-15567 code merge by Peter Shen.'; my $regex = qr/^[A-Z-0-9]+ .*(?<type>chore|ci|docs|feat|fix|perf|refactor|revert|style|test|¯\\_\(ツ\)_\/¯)(?<scope>\(\w+\)?((?=:\s)|(?=!:\s)))?(?<breaking>!)?(?<subject>:\s.*)?|^(?<merge>Merge.* \w+)|^(?<revert>Revert.* \w+)/mp; if ( $str =~ /$regex/g ) { print "Whole match is ${^MATCH} and its start/end positions can be obtained via \$-[0] and \$+[0]\n"; # print "Capture Group 1 is $1 and its start/end positions can be obtained via \$-[1] and \$+[1]\n"; # print "Capture Group 2 is $2 ... and so on\n"; } # ${^POSTMATCH} and ${^PREMATCH} are also available with the use of '/p' # Named capture groups can be called via $+{name}

Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for Perl, please visit: http://perldoc.perl.org/perlre.html