Regular Expressions 101

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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

/
/
gmiu

Test String

Code Generator

Language

Generated Code

use strict; my $str = '51 bis rue du 26eme régiment d\'infanterie 51 ter rue du 26eme régiment d\'infanterie 51,bis,rue du 26eme régiment d\'infanterie 51 rue du 26eme régiment d\'infanterie 51 rue d\'Alençon et son apostrophe 51 rue ,du 26eme régiment d\'infanterie avec une virgule qui traine 51 bis contre-allée du tiret dans le type de voie 51 rue équateur avec accent en premier caractère de nom de voie 51- rue du tiret inutile après le chiffre 10-12 rue de l\'intervalle de numéros de rue 10-12-14-18 rue de l\'intervalle beaucoup trop long 51 bis rue -de \' ; la - ,po-nctuation mise n\'importe où 51 bis - rue - du 26eme régiment d\'infanterie'; my $regex = qr/^([1-9][0-9]*(?:-[1-9][0-9]*)*)[\s,-]+(?:(bis|ter|qua)[\s,-]+)?([\w]+[\-\w]*)[\s,]+([-\w].+)$/miup; 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