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

re = /@(.+?):/ str = 'rainyear@hotmail.com:pepper rajkomatt3@gmail.com:wehttam12 rakkasan240b@gmail.com:dn38416 rallytruckgnome@gmail.com:urban12 rammer388@gmail.com:ryanm08 ramonlopezjr@gmail.com:26may2001 ramsec@live.com:ramseywii1 randomhulu@gmail.com:moppel12 rangeman101@hotmail.co.uk:warcraft4 rangerkid1997@gmail.com:fetherolf5432 ranglinm@yahoo.com:rang94631 raphhashem@gmail.com:31951raph rappe.austin@gmail.com:Elle4637096 ratof81@gmail.com:lovecraft1 raxarraxar@gmail.com:48oakao42 raylonlong@gmail.com:rayray12 rayvale.games@googlemail.com:fDbXh87Xfn ray_2096@hotmail.com:hardys1996 rbenade@hotmail.ca:bandstra1 rcolegreco@gmail.com:Hell0W0rld rdfenton@hotmail.com:scoots55 ' subst = ':' 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