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 = /(?P<ip>.*?) (?P<remote_log_name>.*?) (?P<userid>.*?) \[(?P<date>.*?)(?= ) (?P<timezone>.*?)\] \"(?P<request_method>.*?) (?P<path>.*?)(?P<request_version> HTTP\/.*)?\" (?P<status>.*?) (?P<length>.*?) \"(?P<referrer>.*?)\" \"(?P<user_agent>.*?)\" (?P<session_id>.*?) (?P<generation_time_micro>.*?) (?P<virtual_host>.*)/ str = '1.1.1.2 - - [11/Nov/2016:03:04:55 +0100] "GET /" 200 83 "-" "-" - 9221 1.1.1.1 127.0.0.1 - - [11/Nov/2016:14:24:21 +0100] "GET /uno dos" 404 298 "-" "-" - 400233 1.1.1.1 127.0.0.1 - - [11/Nov/2016:14:23:37 +0100] "GET /uno dos HTTP/1.0" 404 298 "-" "-" - 385111 1.1.1.1 1.1.1.1 - - [11/Nov/2016:00:00:11 +0100] "GET /icc HTTP/1.1" 302 - "-" "XXX XXX XXX" - 6160 11.1.1.1 1.1.1.1 - - [11/Nov/2016:00:00:11 +0100] "GET /icc/ HTTP/1.1" 302 - "-" "XXX XXX XXX" - 2981 1.1.1.1 ' # 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