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

/
/
g

Test String

Code Generator

Language

Generated Code

use strict; my $str = '<table width="100%"><tr><td valign="top" width="80"> <b>wo 1 februari</b> </td> <td> <table width="100%"><tr class="spits-dagdeel spits-Ochtend"><td valign="top" width="60"> <i>Ochtend</i> </td> <td> <p class="spits-2">lichte spits (2) </p> <p>De eerste dag van de nieuwe maand, woensdag. Tijdens de ochtend is het vaak rustig op de wegen en dat zal ook nu het geval zijn. We verwachten op het drukste moment niet meer dan 150 kilometer file op de snelwegen.</p> <p class="spits-klasse"> Bij een lichte spits wordt tot 150 km verwacht. De normale knelpunten hebben files. </p> </td> </tr><tr class="spits-dagdeel spits-Avond"><td valign="top" width="60"> <i>Avond</i> </td> <td> <p class="spits-3">reguliere spits (3) </p> <p>Deze spits iets meer drukte dan tijdens de ochtendspits, maar dat is vrij gebruikelijk. We verwachten geen bijzonderheden. Alleen bij ongelukken kunnen files snel in lengte toenemen.</p> <p class="spits-klasse"> Bij een reguliere spits wordt tot 225 km verwacht. Alle knelpunten hebben files. </p> </td> </tr></table></td> </tr></table>'; my $regex = qr/<i>(?<date>.*)|<p class="spits-[0-9]+">.*(?<intensity>[0-9]+)|<p>(?<description>[\w ,\.:'"]+)|<p class="spits-klasse">(?<default>[\w ,\.:'"]+)/p; 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