Regular Expressions 101

Save & Share

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 = "class=\"snapshot__value-current realtime-push\"><span>(\\d*,\\d*)<span> <span class=\"snapshot__value-unit\">EUR"; final String string = "\n\n" + "</header><main class=\"page-content\"><nav class=\"breadcrumb margin-top-1.00 margin-top-0.50-lg margin-top-0.00-md margin-horizontal-2.00\"><ul class=\"breadcrumb__list\"><li class=\"breadcrumb__item\"><span class=\"breadcrumb__separator icon icon--arrow-double-right\"></span><a class=\"breadcrumb__text\" href=\"/\" title=\"Home\">Home</a></li><li class=\"breadcrumb__item\"><span class=\"breadcrumb__separator icon icon--arrow-double-right\"></span><a class=\"breadcrumb__text\" href=\"/aktienkurse\" title=\"Aktien\">Aktien</a></li><li class=\"breadcrumb__item\"><span class=\"breadcrumb__separator icon icon--arrow-double-right\"></span><span class=\"breadcrumb__text\" title=\"AURELIUS Aktie\">AURELIUS Aktie</span></li><script type=\"application/ld+json\">{\"@context\": \"http://schema.org\",\"@type\": \"BreadcrumbList\",\"itemListElement\": [{\"@type\": \"ListItem\",\"position\": 1,\"item\": {\"@type\": \"WebPage\",\"@id\": \"/\",\"name\": \"Home\"}},{\"@type\": \"ListItem\",\"position\": 2,\"item\": {\"@type\": \"WebPage\",\"@id\": \"/aktienkurse\",\"name\": \"Aktien\"}},{\"@type\": \"ListItem\",\"position\": 3,\"item\": {\"@type\": \"WebPage\",\"@id\": \"/aktien/aurelius-aktie\",\"name\": \"AURELIUS Aktie\"}}]}</script></ul></nav><section class=\"page-content__container\"><!--CenterColumn_1--><div class=\"page-content__item no-grid-container\"><div class=\"snapshot\"><script>document.addEventListener('DOMContentLoaded', function() {if(isFinnetZeroLoginCookieActive()){document.querySelectorAll('.page-content__container .snapshot').forEach(function(e) {e.classList.add('snapshot--is-zero-user');});}});</script><h1 class=\"snapshot__headline\">AURELIUS Aktie</h1><div class=\"snapshot__depot-actions\"><a class=\"snapshot__depot-add\" href=\"/depot/watchlist.asp?isisin=DE000A0JK2A8&inTyp=1\" title=\"Depot / Watchlist\"><span class=\"icon icon--depot-add\"></span></a></div><div id=\"snapshotTrading\" class=\"snapshot__trading\"><div class=\"snapshot__trading-buy-btn button button--success button--stretch-md\"><span class=\"button__label\">Kaufen</span></div><div class=\"snapshot__trading-sell-btn button button--danger button--stretch-md\"><span class=\"button__label\">Verkaufen</span></div></div><div class=\"snapshot__values\"><span id=\"snapshot-value-fst-current-0\" class=\"snapshot__value-current realtime-push\"><span>22,32</span> <span class=\"snapshot__value-unit\">EUR</span> </span><span id=\"snapshot-value-fst-absolute-0\" class=\"snapshot__value-absolut"; 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