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 = /(?:ParentProcessName).+(?:Microsoft Monitoring Agent\\Agent\\MonitoringHost.exe)/m str = '<Event xmlns=\'http://schemas.microsoft.com/win/2004/08/events/event\'><System><Provider Name=\'Microsoft-Windows-Security-Auditing\' Guid=\'{54849625-5478-4994-A5BA-3E3B0328C30D}\'/><EventID>4688</EventID><Version>2</Version><Level>0</Level><Task>13312</Task><Opcode>0</Opcode><Keywords>0x8020000000000000</Keywords><TimeCreated SystemTime=\'2023-11-21T18:59:45.001877100Z\'/><EventRecordID>1190634810</EventRecordID><Correlation/><Execution ProcessID=\'4\' ThreadID=\'12064\'/><Channel>Security</Channel><Computer>SW</Computer><Security/></System><EventData><Data Name=\'SubjectUserSid\'>NT AUTHORITY\\SYSTEM</Data><Data Name=\'SubjectUserName\'>S</Data><Data Name=\'SubjectDomainName\'>MF</Data><Data Name=\'SubjectLogonId\'>0x3e7</Data><Data Name=\'NewProcessId\'>0x1ec0</Data><Data Name=\'NewProcessName\'>C:\\Windows\\System32\\cscript.exe</Data><Data Name=\'TokenElevationType\'>%%1936</Data><Data Name=\'ProcessId\'>0x1b24</Data><Data Name=\'CommandLine\'></Data><Data Name=\'TargetUserSid\'>NULL SID</Data><Data Name=\'TargetUserName\'>-</Data><Data Name=\'TargetDomainName\'>-</Data><Data Name=\'TargetLogonId\'>0x0</Data><Data Name=\'ParentProcessName\'>C:\\Program Files\\Microsoft Monitoring Agent\\Agent\\MonitoringHost.exe</Data><Data Name=\'MandatoryLabel\'>Mandatory Label\\System Mandatory Level</Data></EventData></Event>' # 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