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

r"
"
gis

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 = "(?#remove next set of parenthesis and content because its only for simulating automod)(^|\\W|\\b)(?<!player\\.)(?<!blog\\.)(?<!dev\\.)(?<!link\\.)(?<!affiliate\\.)(?<!meetups\\.)(?<!help\\.)(?<!safety\\.)(?<!devstatus\\.)(?<!brand\\.)(?<!sings\\.)(?<!music\\.)twitch\\.tv\\/(?!embed(\\/|\\b)|subs(\\/|\\b)|directory(\\/|\\b)|p\\/|user(\\/|\\b)|legal(\\/|\\b)|admin(\\/|\\b)|login(\\/|\\b)|signup(\\/|\\b)|jobs(\\/|\\b)|videos(\\/|\\b)|collections(\\/|\\b)|downloads(\\/|\\b)|turbo(\\/|\\b)|store(\\/|\\b)|creatorcamp(\\/|\\b)|settings(\\/|\\b)|giftcard(\\/|\\b)|redeem(\\/|\\b)|broadcast(\\/|\\b)|partner(\\/|\\b)|bits(\\/|\\b)|prime(\\/|\\b))(\\w+)\\/?(?!\\S)(?#remove next set of parenthesis and content because its only for simulating automod)($|\\W|\\b)"; final String string = "https://www.twitch.tv/miametzmusic\n" + "https://www.twitch.tv/miametzmusic\n" + "https://twitch.tv/summit1g\n" + "https://twitch.tv/summit1g/\n" + "https://www.twitch.tv/subsp00ky\n" + "https://www.twitch.tv/subsp00ky/\n\n" + "https://player.twitch.tv/js/embed/v1.js\n" + "https://player.twitch.tv/?channel=miametzmusic&parent=www.example.com\n" + "https://www.twitch.tv/embed/miametzmusic/chat?parent=www.example.com\n" + "https://www.twitch.tv/subs\n" + "https://www.twitch.tv/subs/miametzmusic\n" + "https://www.twitch.tv/directory\n" + "https://www.twitch.tv/directory/all/tags/classical\n" + "https://www.twitch.tv/miametzmusic/about\n" + "https://www.twitch.tv/miametzmusic/schedule\n" + "https://www.twitch.tv/miametzmusic/videos\n" + "https://www.twitch.tv/videos/1821013434\n" + "https://www.twitch.tv/videos/1821013434?t=00h00m13s\n" + "https://www.twitch.tv/collections/EwAtC1IWzhY3Ww\n" + "https://www.twitch.tv/videos/1277407565?collection=EwAtC1IWzhY3Ww\n" + "https://www.twitch.tv/videos/1277407565?collection=EwAtC1IWzhY3Ww&t=00h00m52s\n" + "https://player.twitch.tv/?collection=EwAtC1IWzhY3Ww&video=1277407565&parent=www.example.com\n" + "https://player.twitch.tv/?collection=EwAtC1IWzhY3Ww&video=1277407565&time=0h2m27s&parent=www.example.com\n\n" + "https://www.twitch.tv/p/giftcard/\n" + "https://www.twitch.tv/p/about\n" + "https://www.twitch.tv/p/en/about/\n" + "https://blog.twitch.tv/\n" + "https://blog.twitch.tv/en/\n" + "https://blog.twitch.tv/en/archive/2023/\n" + "https://dev.twitch.tv/\n" + "https://dev.twitch.tv/products/\n" + "https://www.twitch.tv/downloads\n" + "https://www.twitch.tv/jobs\n" + "https://www.twitch.tv/jobs/en/\n" + "https://www.twitch.tv/turbo\n" + "https://www.twitch.tv/store\n" + "https://www.twitch.tv/creatorcamp\n" + "https://www.twitch.tv/creatorcamp/en/paths/\n" + "https://www.twitch.tv/settings/security\n" + "https://link.twitch.tv/devchat\n" + "https://affiliate.twitch.tv/\n" + "https://meetups.twitch.tv/\n" + "https://meetups.twitch.tv/events\n" + "https://help.twitch.tv/\n" + "https://help.twitch.tv/s/article/getting-started-twitch-studio\n" + "https://www.twitch.tv/giftcard/buy?ref_=gc_twitch_landing\n" + "https://www.twitch.tv/redeem\n" + "https://safety.twitch.tv/\n" + "https://safety.twitch.tv/s/article/Usernames\n" + "https://devstatus.twitch.tv/\n" + "https://devstatus.twitch.tv/uptime\n" + "https://www.twitch.tv/broadcast/studio\n" + "https://brand.twitch.tv/\n" + "https://brand.twitch.tv/downloads/twitch-brand-assets.zip\n" + "https://www.twitch.tv/partner/signup\n" + "https://www.twitch.tv/bits\n" + "https://www.twitch.tv/prime\n" + "https://sings.twitch.tv/\n" + "https://music.twitch.tv/"; final Pattern pattern = Pattern.compile(regex, Pattern.CASE_INSENSITIVE | Pattern.DOTALL); 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