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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
Processing...

Test String

Substitution
Processing...

Code Generator

Language

Generated Code

re = /(?| \G(?!\A) # contiguous to the precedent match (inside a comment) (?| -{2,}+([^->][^-]*) # duplicate hyphens, not part of the closing sequence | (-[^-]+) # preserve isolated hyphens | -+ (?=-->) # hyphens before closing sequence, break the contiguity | -->[^<]* (*SKIP)(*FAIL) # closing sequence, go to next <, break contiguity ) | [^<]*<+ # reach the next < (outside comment) (?> [^<]+ <+ )*? # all characters until <!-- (include) (?: !-- \K | [^<]*\z\K (*ACCEPT) ) # new comment or end of the string (?| -*+ ([^->][^-]*) # possible hyphens not followed by > | -+ (?=-->) # hyphens before closing sequence, break the contiguity | -?+ ([^-]+) # one hyphen followed by > | -->[^<]* (*SKIP)(*FAIL) () # closing sequence, go to next <, break contiguity ) # () avoids a misterious bug in regex101, you can remove it ) /x str = '<!----------------- toto --> <!-- toto ----------------------------> <!----> <!-----> <!--->>>>---> asdsd sadasdsad sadasd asdasd asdasd --> asd asdasd <!--- ->>>>>> --------------------------------------- *************************************** AUGMENTATION BLUEPRINTS *************************************** --------------------------------------- --->---- <!-- toto-toto --> <!--OTHER IDEAS -- <anytaghere> <!----PROBABLY NOT:--- <whatever> --><!--' subst = '\\1' 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