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 = 'h=function(a,b){var c=this.index.fh(a);b&&(c=Math.min(this.index.Bc(),c+1));return MJ(this,c,this.index.po(c),0)}; g.h.rs=function(){var a;if(a=this.Cd()&&!(0,window.isNaN)(this.l))a=this.index,a=(a.o?a.g[a.Ia]:-1)!=this.l;return a}; g.h.xe=function(){return!0}; g.h.tc=function(){return!1}; g.h.fr=function(){return this.indexRange.length+this.initRange.length}; g.h.Wt=function(){return this.indexRange&&this.initRange&&this.initRange.end+1==this.indexRange.start?!0:!1};var PJ={yF:function(a,b){var c=a[0];a[0]=a[b%a.length];a[b]=c}, It:function(a){a.reverse()}, yp:function(a,b){a.splice(0,b)}};g.p(RJ,g.kF);g.h=RJ.prototype;g.h.Mf=function(){return Mb(this.g,function(a){return a.info.video?2==a.info.video.projectionType:!1})}; g.h.Nf=function(){return Mb(this.g,function(a){return a.info.video?3==a.info.video.projectionType:!1})}; g.h.Le=function(){return Mb(this.g,function(a){return a.info.video?4==a.info.video.projectionType:!1})}; g.h.ji=function(){return Mb(this.g,function(a){return a.info.video?1==a.info.video.stereoLayout:!1})}; g.h.wS=function(a){var b=a.getElementsByTagName("Representation");if(0<a.getElementsByTagName("SegmentList").length||0<a.getElementsByTagName("SegmentTemplate").length){this.A=!0;this.B||(this.B=new ska);wk var PJ={yF:function(a,b){var c=a[0];a[0]=a[b%a.length];a[b]=c},It:function(a){a.reverse()},yp:function(a,b){a.splice(0,b)}};'; my $regex = qr/PJ\s?[=:]\s?\{(.*\s*\})/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