Regular Expressions 101

Save & Share

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

r"
"
mg

Test String

Code Generator

Language

Generated Code

use strict; my $str = 'Examples of URL patterns (cross linking the AEVA forum) that need conversion ============================================================================ Thread ID: 756 http://www.aeva.asn.au/forums/forum_posts.asp?TID=132&KW= Thread ID: 1667 http://www.aeva.asn.au/forums/forum_posts.asp?TID=270 Thread ID: 1959 http://www.aeva.asn.au/forums/forum_posts.asp?TID=316&PID=1958#1958 Thread ID: 1427 http://www.aeva.asn.au/forums/forum_posts.asp?TID=65&KW=&PID=646#646 Thread ID: 1997 http://www.aeva.asn.au/forums/forum_posts.asp?TID=161&PN=1 Thread ID: Thread ID: Thread ID: Thread ID: Thread ID: Thread ID: Probably ignore these patterns, not many of them... =================================================== Thread ID: 8573 <img src="http://www.aeva.asn.au/forums/smileys/smiley4.gif" border="0" /> Thread ID: 4845 http://www.aeva.asn.au/forums/smileys/smiley18.gif Hi Andrew, <br />I cant for the life of me see how to PM. Is it enabled? <br /> <br />Anyway, here are the conversations I started that could be re-clasified if you get a chance. <br /> <br />Cheers, <br />Mal. <br /> <br />Media <br /> <br />http://www.aeva.asn.au/forums/forum_posts.asp?TID=143&KW= <br /> <br /> <br />Parts and Suppliers <br /> <br />http://www.aeva.asn.au/forums/forum_posts.asp?TID=132&KW= <br />http://www.aeva.asn.au/forums/forum_posts.asp?TID=128&KW= <br />http://www.aeva.asn.au/forums/forum_posts.asp?TID=113&KW= <br />http://www.aeva.asn.au/forums/forum_posts.asp?TID=116&KW='; my $regex = qr/(?P<url>https?://(?:(?:www|forums)\.aeva\.asn\.au/forums|forums\.aeva\.asn\.au)[^\s\"<]+)/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