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 = '{"unit":{"id":1,"val":"px","name":"px"},"type":{"id":3,"val":"HORIZONTAL_BAR","name":"Horizontal Bar"},"zoom":{"id":2,"val":"DEFAULT","name":"Show"},"scale":{"id":2,"val":"TRUE","name":"Show"},"fullscreen":{"id":1,"val":"FALSE","name":"Hide"},"street":{"id":2,"val":"TRUE","name":"Show"},"poi":{"id":1,"val":"FALSE","name":"Disable"},"draggable":{"id":2,"val":"TRUE","name":"Enable"},"doubleclick":{"id":2,"val":"TRUE","name":"Enable"},"mouse":{"id":2,"val":"TRUE","name":"Enable"},"gesture":{"id":2,"val":"auto","name":"Auto"},"map":{"id":1,"val":"ROADMAP","name":"Road Map"},"mapid":"mapkit-9479","api":"","lat":"51.343695608206275","lng":"-2.4871419408111706","zoomlvl":13,"width":600,"height":400,"position":{},"route":{},"infowindow":{"enable":false,"title":false,"tel":false,"email":false,"web":false,"desc":false},"visible":1,"lon":"-2.4871419408111706","user_id":4575,"map_url":"26T9Te","snazzy":{"id":12,"snazzy_id":11,"name":"Blue","json":"[{\\"featureType\\":\\"all\\",\\"stylers\\":[{\\"hue\\":\\"#0000b0\\"},{\\"invert_lightness\\":"true"},{\\"saturation\\":-30}]}]"}}'; my $regex = qr/\\"(.*?)\\"/p; my $subst = '"$1"'; 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