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

/
/
gm

Test String

Code Generator

Language

Generated Code

use strict; my $str = '--- SHOULD MATCH --- 20181215144545-06:00 2018-12-15T14:45:45 -06:00 2018-12-15 14:45:45 -06:00 2018.12.15T14.45.45 -06:00 2018.12.15T14.45.45-06.00 2018/12/15T14:45:45-06:00 201812151445450000 103212150000000000 103212151111111111 103212152222221222 --- SHOULD NOT MATCH --- 2018-13-15T14:45:45 -06:00 2018-12-60T14:45:45 -06:00 2018-12-15T24:45:45 -06:00 2018-12-15T14:60:45 -06:00 103212152222222222 103212152222221322'; my $regex = qr/^(?<year>\d{4})[\-\.\/]?(?<month>0[1-9]|1[02])[\-\.\/]?(?<day>[0-2]\d|3[0-1])[ T]?(?<hour>[0-1]\d|2[0-3])[\:\.]?(?<minute>[0-5]\d)[\:\.]?(?<second>[0-5]\d) ?(?<offset>(?<offset_sign>[\-\+]*)(?<offset_hour>0[0-9]|1[0-2])[\:\.]?(?<offset_minute>[0-5]\d))/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