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

using System; using System.Text.RegularExpressions; public class Example { public static void Main() { string pattern = @"\b\((.*?)\)|\buid=(\w+)|\bname=(.*?)\s"; string input = @"type=SYSCALL msg=audit(24/03/17 09:15:51.570:13045) : arch=x86_64 syscall=unlink success=yes exit=0 a0=0x563dbbd69762 a1=0x7f6e46b32e15 a2=0x0 a3=0x563dbbc07a00 items=2 ppid=1670 pid=2247 auid=unset uid=stacksmasher gid=stacksmasher euid=stacksmasher suid=stacksmasher fsuid=stacksmasher egid=stacksmasher sgid=stacksmasher fsgid=stacksmasher tty=(none) ses=unset comm=mate-session exe=/usr/bin/mate-session key=sinkingeye type=PATH msg=audit(24/03/17 09:15:51.854:13138) : item=1 name=/tmp/.X0-lock inode=8519683 dev=08:01 mode=file,444 ouid=root ogid=root rdev=00:00 nametype=DELETE type=PATH msg=audit(24/03/17 09:15:51.854:13138) : item=0 name=/tmp/ inode=8519681 dev=08:01 mode=dir,sticky,777 ouid=root ogid=root rdev=00:00 nametype=PARENT"; foreach (Match m in Regex.Matches(input, pattern)) { 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