Regular Expressions 101

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Function

  • Match
  • Substitution
  • List
  • Unit Tests (18)

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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 Brownsburg-Chatham assert that regex does match
given the string Cap-Santé assert that regex does match
given the string Côte Saint-Luc assert that regex does match
given the string Coteau-du-Lac assert that regex does match
given the string Estérel assert that regex does match
given the string L'Ancienne-Lorette assert that regex does match
given the string St. Albert assert that regex does match
given the string Los Angeles assert that regex does match
given the string Calgary assert that regex does match
given the string Calgary assert that regex does not match
given the string Calgary assert that regex does not match
given the string $aint John assert that regex does not match
given the string Néewiller-près-lauterbourg assert that regex does match
given the string Line Feed assert that regex does not match
given the string Two Spaces assert that regex does not match
given the string Tab Character assert that regex does not match
given the string Toront8 assert that regex does not match
given the string '. ' assert that regex does not match