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

use strict; my $str = '<Event xmlns=\'http://schemas.microsoft.com/win/2004/08/events/event\'><System><Provider Name=\'Microsoft-Windows-Security-Auditing\' Guid=\'{54849625-5478-4994-A5BA-3E3B0328C30D}\'/><EventID>4656</EventID><Version>1</Version><Level>0</Level><Task>12801</Task><Opcode>0</Opcode><Keywords>0x8020000000000000</Keywords><TimeCreated SystemTime=\'2020-08-12T19:47:25.544399300Z\'/><EventRecordID>1397935969</EventRecordID><Correlation/><Execution ProcessID=\'716\' ThreadID=\'728\'/><Channel>Security</Channel><Computer>svr-apl-cit-01.BANCOREGIONAL.LOCAL</Computer><Security/></System><EventData><Data Name=\'SubjectUserSid\'>NT AUTHORITY\\SYSTEM</Data><Data Name=\'SubjectUserName\'>SVR-APL-CIT-01$</Data><Data Name=\'SubjectDomainName\'>BANCOREGIONAL</Data><Data Name=\'SubjectLogonId\'>0x3e7</Data><Data Name=\'ObjectServer\'>Security</Data><Data Name=\'ObjectType\'>Key</Data><Data Name=\'ObjectName\'>\\REGISTRY\\MACHINE\\SYSTEM\\ControlSet001\\Services\\SamSs</Data><Data Name=\'HandleId\'>0x584</Data><Data Name=\'TransactionId\'>{00000000-0000-0000-0000-000000000000}</Data><Data Name=\'AccessList\'>%%1537 %%1538 %%1539 %%1540 %%4432 %%4433 %%4434 %%4435 %%4436 %%4437 </Data><Data Name=\'AccessReason\'>-</Data><Data Name=\'AccessMask\'>0xf003f</Data><Data Name=\'PrivilegeList\'>-</Data><Data Name=\'RestrictedSidCount\'>0</Data><Data Name=\'ProcessId\'>0x1ec0</Data><Data Name=\'ProcessName\'>C:\\Windows\\System32\\CpqMgmt\\cqmghost\\cqmghost.exe</Data><Data Name=\'ResourceAttributes\'>-</Data></EventData></Event>'; my $regex = qr/\<EventID\>4656\<\/EventID\>.*\<Data Name\=\'ProcessName\'\>(C|D|E|F):\\Windows\\System32\\CpqMgmt\\cqmghost\\cqmghost\.exe/mp; if ( $str =~ /$regex/g ) { print "Whole match is ${^MATCH} and its start/end positions can be obtained via \$-[0] and \$+[0]\n"; # print "Capture Group 1 is $1 and its start/end positions can be obtained via \$-[1] and \$+[1]\n"; # print "Capture Group 2 is $2 ... and so on\n"; } # ${^POSTMATCH} and ${^PREMATCH} are also available with the use of '/p' # Named capture groups can be called via $+{name}

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 Perl, please visit: http://perldoc.perl.org/perlre.html