Regular Expressions 101

Save & Manage Regex

  • Current Version: 1
  • Save & Share
  • Community Library

Flavor

  • PCRE2 (PHP)
  • ECMAScript (JavaScript)
  • Python
  • Golang
  • Java
  • .NET 7.0 (C#)
  • Rust
  • PCRE (Legacy)
  • Regex Flavor Guide

Function

  • Match
  • Substitution
  • List
  • Unit Tests
Sponsors
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

import java.util.regex.Matcher; import java.util.regex.Pattern; public class Example { public static void main(String[] args) { final String regex = "\\b\\((.*?)\\)|\\buid=(\\w+)|\\bname=(.*?)\\s"; final String string = "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\n\n" + "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 \n" + "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"; final Pattern pattern = Pattern.compile(regex); final Matcher matcher = pattern.matcher(string); while (matcher.find()) { System.out.println("Full match: " + matcher.group(0)); for (int i = 1; i <= matcher.groupCount(); i++) { System.out.println("Group " + i + ": " + matcher.group(i)); } } } }

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 Java, please visit: https://docs.oracle.com/javase/7/docs/api/java/util/regex/Pattern.html