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 = /Køretøjsliste for \d{7} for dato \d{2}.\d{2}.\d{4} - \d{2}.\d{2}.\d{4}.xls/m str = 'Køretøjsliste for 4874349 for dato 31.01.2020 - 01.05.2020.xls Køretøjsliste for 4874351 for dato 30.02.2021 - 03.10.2021.xls Køretøjsliste for 4874352 for dato 29.03.2022 - 09.06.2022.xls Køretøjsliste for 4874353 for dato 28.04.2022 - 11.09.2022.xls Køretøjsliste for 4874354 for dato 27.05.2022 - 15.12.2022.xls Køretøjsliste for 4874355 for dato 26.06.2023 - 22.07.2023.xls Køretøjsliste for 4874356 for dato 25.07.2022 - 27.08.2022.xls Køretøjsliste for 4874357 for dato 24.09.2029 - 28.12.2029.xls Køretøjsliste for 4874358 for dato 11.10.2015 - 29.10.2015.xls Køretøjsliste for 4874359 for dato 04.11.2024 - 30.11.2025.xls Køretøjsliste for 4874360 for dato 01.12.2028 - 31.12.2029.xls' # 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