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

/
/
gm

Test String

Code Generator

Language

Generated Code

re = /^([[:xdigit:]]{1,4}(?::[[:xdigit:]]{1,4}){7}|::|:(?::[[:xdigit:]]{1,4}){1,6}|[[:xdigit:]]{1,4}:(?::[[:xdigit:]]{1,4}){1,5}|(?:[[:xdigit:]]{1,4}:){2}(?::[[:xdigit:]]{1,4}){1,4}|(?:[[:xdigit:]]{1,4}:){3}(?::[[:xdigit:]]{1,4}){1,3}|(?:[[:xdigit:]]{1,4}:){4}(?::[[:xdigit:]]{1,4}){1,2}|(?:[[:xdigit:]]{1,4}:){5}:[[:xdigit:]]{1,4}|(?:[[:xdigit:]]{1,4}:){1,6}:)$/m str = ':: ::123 ::123:456 ::123:456:789 ::123:456:789:abc:def:6666 ::123:456:789:abc:def:6666:7 123::456 123::456:789 123::456:789:abc 123::456:789:abc:def 123::456:789:abc:def:6 123::456:789:abc:def:6:7 123:456::789 123:456::789:abc 123:456::789:abc:def 123:456::789:abc:def:6666 123:456::789:abc:def:6666:7 123:456:789::abc 123:456:789::abc:def 123:456:789::abc:def:6666 123:456:789::abc:def:6666:7 123:456:789:abc::def 123:456:789:abc::def:6666 123:456:789:abc::def:66666:7 123:456:789:abc:def::6666 123:456:789:abc:def::6666:7 123:456:789:abc:def:6666:: 123:456:789:abc:def:: 123:456:789:abc:: 123:456:789:: 123:456:: 123:: 123::456:789:abc:def:6666 123:456:789:abc:def:6666:7 123::456::abc ' # Print the match result str.scan(re) do |match| puts match.to_s end

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