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]
  • Character class intersection
    [\w&&[^\d]]
  • 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
Processing...

Test String

Substitution
Processing...

Code Generator

Language

Generated Code

re = /\[(\/?\w+\:?\w+)\]/m str = ' [shake2][wave]朝から私の大好きな[scream][big]死[/scream][/big]のにおいがするな...[/wave][/shake2] [shake2]お前を殺すには骨がおれるが、しかし利益は大きい。ハッハッハ！[/shake2] [shake2]おや、心がおれそうだって？もう全てを放り出してあきらめたらどうだ。キッド[/shake2] [shake2]そんなに死んでしまうのが好きなら、死とチューしちゃえばいいのに！[/shake2] 何か無くなった気がするだって？もし、お前が[icon:camerabadge]カメラバッジを持っているなら、撮影ポーズ中に見回して、その[name]何か[/name]を探してみればいい... \\[(\\w+)\\](.*)\\[\\/\\1\\]' subst = '$2' result = str.gsub(re, subst) # Print the result of the substitution puts result

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 Ruby, please visit: http://ruby-doc.org/core-2.2.0/Regexp.html