Regular Expressions 101

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Function

  • Match
  • Substitution
  • List
  • Unit Tests (19)

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An explanation of your regex will be automatically generated as you type.
  • 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

/
/

Unit Tests

given the string -Robert Smith assert that regex does not match
given the string Audry Zieme assert that regex does not match
given the string ¡Nick Conroy! assert that regex does not match
given the string R. Canelo assert that regex does not match
given the string Manuel assert that regex does not match
given the string Popman15 Root assert that regex does not match
given the string Roberta Seclén assert that regex does match
given the string Cristhian Cañaris assert that regex does match
given the string Javier Agüero assert that regex does match
given the string Hae Breitenberg assert that regex does match
given the string Lyle O'Reilly assert that regex does match
given the string Lorina O'Keefe assert that regex does match
given the string Tameika Quitzon assert that regex does match
given the string Cari Hilpert assert that regex does match
given the string Queenie Littel assert that regex does match
given the string Ramon Lubowitz assert that regex does match
given the string Zana VonRuede assert that regex does match
given the string Elias McCullough assert that regex does match
given the string Emory Monahan assert that regex does match