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

/
/
gm

Test String

Code Generator

Language

Generated Code

use strict; my $str = '60-B-1230S 60-B-1230ABCDEF 60-B-1230A-F 60-B-1230A/F 60-B-1230A~H,0290A~H 35-K-0101A/B,0201A/B,0301A/B 35-E-0102A~C, 0202A~C, 0302A~C 35-E-0103A~H, 0203A~H, 0303A~H 35-E-0101A/B, 0201A/B, 0301A/B 35-E-0104A/B, 0204A/B, 0304A/B 35-P-0101A/B, 0201A/B, 0301A/B 35-P-0102A/B, 0202A/B, 0302A/B 35-P-0103A/B, 0203A/B, 0303A/B 35-P-0104A/B, 0204A/B, 0304A/B 35-P-0105A/B, 0205A/B, 0305A/B 35-P-0106/S, 0206, 0306 35-P-0107/S, 0207, 0307 35-P-0109A/B, 0209A/B, 0309A/B 35-P-0111A/B 35-P-0401A/B 92-P-0101A/B 35-V-0108, 0208, 0308 '; my $regex = qr/(\/?[S])|(\,)|([A-Z]\~[A-Z])|([A-Z]\-[A-Z]$)|([A-Z]\/[A-Z])|([A-Z]{2,}$)/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