Regular Expressions 101

Save & Share

  • Regex Version: ver. 1
  • Update Regex
    ctrl+⇧+s
  • Save new Regex
    ctrl+s
  • Add to Community Library

Flavor

  • PCRE2 (PHP >=7.3)
  • PCRE (PHP <7.3)
  • ECMAScript (JavaScript)
  • Python
  • Golang
  • Java 8
  • .NET 7.0 (C#)
  • Rust
  • Regex Flavor Guide

Function

  • Match
  • Substitution
  • List
  • Unit Tests

Tools

Sponsors
There are currently no sponsors. Become a sponsor today!
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

import java.util.regex.Matcher; import java.util.regex.Pattern; public class Example { public static void main(String[] args) { final String regex = "((?:.+\\R){5})"; final String string = "Accord.dll\n" + " Directory: C:\\Program Files (x86)\\TheApp\\Hardware\n" + " Product Version: 3.8.0\n" + " File Version: 3.8.0.6134\n" + " Creation Date: 01/29/2019 12:58:20\n\n" + "Accord.Video.DirectShow.dll\n" + " Directory: C:\\Program Files (x86)\\TheApp\\Hardware\n" + " Product Version: 3.8.0\n" + " File Version: 3.8.0.6134\n" + " Creation Date: 01/29/2019 12:58:20\n\n" + "Accord.Video.dll\n" + " Directory: C:\\Program Files (x86)\\TheApp\\Hardware\n" + " Product Version: 3.8.0\n" + " File Version: 3.8.0.6134\n" + " Creation Date: 01/29/2019 12:58:20\n\n" + "Advantech.Adam.dll\n" + " Directory: C:\\Program Files (x86)\\TheApp\\Hardware\n" + " Product Version: 7.2.0.0\n" + " File Version: 7.2.0.0\n" + " Creation Date: 09/03/2018 16:48:40\n\n" + "Advantech.Common.dll\n" + " Directory: C:\\Program Files (x86)\\TheApp\\Hardware\n" + " Product Version: 7.2.0.0\n" + " File Version: 7.2.0.0\n" + " Creation Date: 09/03/2018 16:48:40\n\n" + "Advantech.Protocol.dll\n" + " Directory: C:\\Program Files (x86)\\TheApp\\Hardware\n" + " Product Version: 7.2.0.0\n" + " File Version: 7.2.0.0\n" + " Creation Date: 09/03/2018 16:48:40\n\n" + "Autofac.dll\n" + " Directory: C:\\Program Files (x86)\\TheApp\\Hardware\n" + " Product Version: 4.8.1\n" + " File Version: 4.8.1.0\n" + " Creation Date: 01/29/2019 12:58:20\n\n" + "Autofac.Integration.Owin.dll\n" + " Directory: C:\\Program Files (x86)\\TheApp\\Hardware\n" + " Product Version: 4.2.0-CI-247\n" + " File Version: 4.2.0.247\n" + " Creation Date: 01/29/2019 12:58:20\n\n" + "Autofac.Integration.SignalR.dll\n" + " Directory: C:\\Program Files (x86)\\TheApp\\Hardware\n" + " Product Version: 4.0.0-CI-228\n" + " File Version: 4.0.0.228\n" + " Creation Date: 01/29/2019 12:58:20\n\n" + "Autofac.Integration.WebApi.dll\n" + " Directory: C:\\Program Files (x86)\\TheApp\\Hardware\n" + " Product Version: 4.0.0-CI-229\n" + " File Version: 4.0.0.229\n" + " Creation Date: 01/29/2019 12:58:20\n\n" + "Autofac.Integration.WebApi.Owin.dll\n" + " Directory: C:\\Program Files (x86)\\TheApp\\Hardware\n" + " Product Version: 4.0.0-CI-226\n" + " File Version: 4.0.0.226\n" + " Creation Date: 01/29/2019 12:58:20\n\n" + "DirectShowLib-2005.dll\n" + " Directory: C:\\Program Files (x86)\\TheApp\\Hardware\n" + " Product Version: 2.1.0.0\n" + " File Version: 2.1.0.0\n" + " Creation Date: 09/03/2018 16:48:40\n\n" + "DTKANPR.dll\n" + " Directory: C:\\Program Files (x86)\\TheApp\\Hardware\n" + " Product Version: 1.3.34\n" + " File Version: 1.3.34\n" + " Creation Date: 09/03/2018 16:48:40\n\n" + "DTKRES1.dll\n" + " Directory: C:\\Program Files (x86)\\TheApp\\Hardware\n" + " Product Version: 1.3.34\n" + " File Version: 1.3.34\n" + " Creation Date: 09/03/2018 16:48:40\n\n" + "Dynamitey.dll\n" + " Directory: C:\\Program Files (x86)\\TheApp\\Hardware\n" + " Product Version: 2.0.9.136\n" + " File Version: 2.0.9.136\n" + " Creation Date: 01/29/2019 12:58:20\n\n" + "Fasterflect.dll\n" + " Directory: C:\\Program Files (x86)\\TheApp\\Hardware\n" + " Product Version: 2.1.3\n" + " File Version: 2.1.3\n" + " Creation Date: 01/29/2019 12:58:20\n\n" + "ImpromptuInterface.dll\n" + " Directory: C:\\Program Files (x86)\\TheApp\\Hardware\n" + " Product Version: 7.0.1\n" + " File Version: 7.0.1.0\n" + " Creation Date: 01/29/2019 12:58:20\n\n" + "inpout32.dll\n" + " Directory: C:\\Program Files (x86)\\TheApp\\Hardware\n" + " Product Version: 1, 5, 0, 0\n" + " File Version: 1, 5, 0, 0\n" + " Creation Date: 09/03/2018 16:48:40\n\n" + "inpoutx64.dll\n" + " Directory: C:\\Program Files (x86)\\TheApp\\Hardware\n" + " Product Version: 1, 5, 0, 0\n" + " File Version: 1, 5, 0, 0\n" + " Creation Date: 09/03/2018 16:48:40\n\n" + "JetBrains.Annotations.dll\n" + " Directory: C:\\Program Files (x86)\\TheApp\\Hardware\n" + " Product Version: 2018.2.1\n" + " File Version: 2018.2.1.0\n" + " Creation Date: 01/29/2019 12:58:20\n\n" + "log4net.dll\n" + " Directory: C:\\Program Files (x86)\\TheApp\\Hardware\n" + " Product Version: 2.0.8.0-.NET 4.5\n" + " File Version: 2.0.8.0\n" + " Creation Date: 01/29/2019 12:58:20\n\n" + "vjsnativ.dll\n" + " Directory: C:\\Program Files (x86)\\TheApp\\Hardware\n" + " Product Version: 2.0.50727.937\n" + " File Version: 2.0.50727.937 (jsertm.050727-9300)\n" + " Creation Date: 09/03/2018 16:48:40\n\n" + "vjssupuilib.dll\n" + " Directory: C:\\Program Files (x86)\\TheApp\\Hardware\n" + " Product Version: 2.0.50727.937\n" + " File Version: 2.0.50727.937 (jsertm.050727-9300)\n" + " Creation Date: 09/03/2018 16:48:42\n\n" + "vjsvwaux.dll\n" + " Directory: C:\\Program Files (x86)\\TheApp\\Hardware\n" + " Product Version: 2.0.50727.937\n" + " File Version: 2.0.50727.937 (jsertm.050727-9300)\n" + " Creation Date: 09/03/2018 16:48:40\n\n" + "vjswfc.dll\n" + " Directory: C:\\Program Files (x86)\\TheApp\\Hardware\n" + " Product Version: 2.0.50727.937\n" + " File Version: 2.0.50727.937 (jsertm.050727-9300)\n" + " Creation Date: 09/03/2018 16:48:42\n\n" + "VJSWfcBrowserStubLib.dll\n" + " Directory: C:\\Program Files (x86)\\TheApp\\Hardware\n" + " Product Version: 2.0.50727.937\n" + " File Version: 2.0.50727.937 (jsertm.050727-9300)\n" + " Creation Date: 09/03/2018 16:48:40\n\n" + "vjswfccw.dll\n" + " Directory: C:\\Program Files (x86)\\TheApp\\Hardware\n" + " Product Version: 2.0.50727.937\n" + " File Version: 2.0.50727.937 (jsertm.050727-9300)\n" + " Creation Date: 09/03/2018 16:48:40\n\n" + "vjswfchtml.dll\n" + " Directory: C:\\Program Files (x86)\\TheApp\\Hardware\n" + " Product Version: 2.0.50727.937\n" + " File Version: 2.0.50727.937 (jsertm.050727-9300)\n" + " Creation Date: 09/03/2018 16:48:42\n\n"; final Pattern pattern = Pattern.compile(regex, Pattern.MULTILINE); 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