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
Processing...

Test String

Code Generator

Language

Generated Code

use strict; my $str = '# match /kleinanzeigen/cat_48_5030_ct_0_page_2.html /hunde/Franz%C3%B6sische+Bulldogge/prp_adrace_ct_0_page_2.html # no match /hunde/Mischling/Welpe/R%C3%BCde/euskirchen/prp_adrace_aage_asex_ct_119703.html /hunde/Kangal/Welpe/H%C3%BCndin/neuhofen/prp_adrace_aage_asex_ct_122319.html /hunde/Deutsch+Drahthaar/duesseldorf/prp_adrace_ct_119205.html /hunde/aus+Tierheim/R%C3%BCde/bergneustadt/prp_aprop_asex_ct_119541.html /hunde/Zwergpudel/Welpe/zuelpich/prp_adrace_aage_ct_119706.html /hunde/Chihuahua/in+Not/H%C3%BCndin/duisburg/prp_adrace_aprop_asex_ct_119281.html /hunde/Mischling/aus+Tierheim/Welpe/mommenheim/prp_adrace_aprop_aage_ct_120384.html /hunde/Sonstige+Hunde/goeppingen/prp_adrace_ct_123004.html /hunde/Deutscher+Jagdterrier/filderstadt/prp_adrace_ct_122759.html /hunde/Mischling/in+Not/H%C3%BCndin/reinheim/prp_adrace_aprop_asex_ct_121905.html'; my $regex = qr/^/(hunde|kleinanzeigen)/(?!.*/[a-z]+/).*(prp_[a-z0-9_]+_\d+|cat_48_5030.*)\.html$/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