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

Substitution

Processing...

Code Generator

Language

Generated Code

use strict; my $str = '382829:239091~0;0_01_12_23_34_45_56_67_78_89_9!1;1_22_33_44_55_66_77_88_9!9_02;2_43_54_65_76_87_9!8_09_13;3_64_75_86_9!7_08_19_24;4_85_9!6_07_18_29_35;5_06_17_28_39_46;6_27_38_49_57;7_48_59_68;8_69_79;9_8~!0;1~~01234567890'; my $regex = qr/(\d)(?=\d*:)(?=.{6}(\d)\d*~.*?(\1;.*?\2_(\d)|\2;.*?\1_(\d)))|(\d)(?=\d*~)(?<=(\d)..{6})(?=\d*~.*?(\6;.*?\7_.*?(!|;)|\7;.*?\6_.*?(!|;)))(?=\d*~.*~.*?(\9(.)|\10(.)))|~.*?~.*?~/p; my $subst = '$4$5$12$13'; my $result = $str =~ s/$regex/$subst/rg; print "The result of the substitution is' $result\n";

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