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
Processing...

Test String

Code Generator

Language

Generated Code

re = /(?<=Set-Cookie: __RequestVerificationToken=).{108}/m str = 'HTTP/1.1 200 OK Cache-Control: private Content-Type: text/html; charset=utf-8 Set-Cookie: __RequestVerificationToken=6JBpdPLoWg2ON0CbCTTCffsZZsCU_rRGlmarVTRfg4Gu1_6FEqpgd_jcLbN_mBWdXJjCeYw6DQ3nxd8hABsNTpRWJALapk9KUZhu6jGkh0I1; path=/; HttpOnly X-Frame-Options: SAMEORIGIN X-XSS-Protection: 1; mode=block X-Content-Type-Options: nosniff strict-transport-security: max-age=60; includeSubDomains referrer-policy: strict-origin-when-cross-origin Set-Cookie: httpOnly X-Content-Security-Policy: script-src \'self\' https://fonts.gstatic.com Date: Wed, 12 Feb 2020 15:46:34 GMT Content-Length: 3124' # 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