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]
  • Character class intersection
    [\w&&[^\d]]
  • 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 = "(?:^|,)([A-Za-z\\-]+?)(?::[A-Z\\-]+)?=(\".+?\"|\\d+?)(?=,|$)"; final String string = "EXT-X-DATERANGE:ID=\"PreRoll_Ident_Open\",START-DATE=\"2016-12-14T120000.000z\",DURATION=3,X-PlayHeadStart=\"0.000\",X-AdID=\"AA-1QPN49M9H2112\",X-TRANSACTION-VPRN-ID=\"1486060788\",X-TrackingDefault=\"1\",X-TrackingDefaultURI=\"http,//606ca.v.fwmrm.net/ad/l/1?s=g015&n=394953%3B394953&t=1485791181366184015&f=&r=394953&adid=15914070&reid=5469372&arid=0&auid=&cn=defaultImpression&et=i&_cc=15914070,5469372,,,1485791181,1&tpos=0&iw=&uxnw=394953&uxss=sg579054&uxct=4&metr=1031&init=1&vcid2=394953%3A466c5842-0cce-4a16-9f8b-a428e479b875&cr=\"s=0&iw=&uxnw=394953&uxss=sg579054&uxct=4&metr=1031&init=1&vcid2=394953%3A466c5842-0cce-4a16-9f8b-a428e479b875&cr=\""; 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