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

using System; using System.Text.RegularExpressions; public class Example { public static void Main() { string pattern = @"\<EventID\>4656\<\/EventID\>.*\<Data Name\=\'ProcessName\'\>(C|D|E|F):\\Windows\\System32\\CpqMgmt\\cqmghost\\cqmghost\.exe"; string input = @"<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>"; RegexOptions options = RegexOptions.Multiline; foreach (Match m in Regex.Matches(input, pattern, options)) { Console.WriteLine("'{0}' found at index {1}.", m.Value, m.Index); } } }

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 C#, please visit: https://msdn.microsoft.com/en-us/library/system.text.regularexpressions.regex(v=vs.110).aspx