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 $str = '<html> <head>~~</head> <body> <div>contents</div> <script> var value1 = 55;var value2= 27; var value3 = \'T\';var value4 = "FIT#$%SIZE"; var value5 = \'{\\"P00000WJ000E\\":{\\"stock_price\\":\\"0.00\\",\\"use_stock\\":true,\\"use_soldout\\":\\"T\\",\\"is_display\\":\\"T\\",\\"is_selling\\":\\"T\\",\\"option_price\\":79000,\\"option_name\\":\\"FIT#$%SIZE\\",\\"option_value\\":\\"NOBLE-44\\",\\"stock_number\\":26,\\"option_value_orginal\\":[\\"NOBLE\\",\\"44\\"],\\"use_stock_original\\":\\"T\\",\\"use_soldout_original\\":\\"T\\",\\"use_soldout_today_delivery\\":\\"F\\",\\"is_auto_soldout\\":\\"F\\",\\"is_mandatory\\":\\"T\\",\\"option_id\\":\\"000E\\",\\"is_reserve_stat\\":\\"N\\",\\"item_image_file\\":null,\\"origin_option_added_price\\":\\"0.00\\"}}\';var value6 = \'1\';var value7 = \'string;must-catch\'; var value8 = 8; var value9 = \'S\'; var value10 = \'T\'; </script> </body> </html>'; my $regex = qr/var\s(\w+)\s?\=\s?(\d+|\"[^\n"]*\"|\'[^\n']*\')\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