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

package main import ( "regexp" "fmt" ) func main() { var re = regexp.MustCompile(`(?is)(?#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)`) var str = `https://www.twitch.tv/miametzmusic https://www.twitch.tv/miametzmusic https://twitch.tv/summit1g https://twitch.tv/summit1g/ https://www.twitch.tv/subsp00ky https://www.twitch.tv/subsp00ky/ https://player.twitch.tv/js/embed/v1.js https://player.twitch.tv/?channel=miametzmusic&parent=www.example.com https://www.twitch.tv/embed/miametzmusic/chat?parent=www.example.com https://www.twitch.tv/subs https://www.twitch.tv/subs/miametzmusic https://www.twitch.tv/directory https://www.twitch.tv/directory/all/tags/classical https://www.twitch.tv/miametzmusic/about https://www.twitch.tv/miametzmusic/schedule https://www.twitch.tv/miametzmusic/videos https://www.twitch.tv/videos/1821013434 https://www.twitch.tv/videos/1821013434?t=00h00m13s https://www.twitch.tv/collections/EwAtC1IWzhY3Ww https://www.twitch.tv/videos/1277407565?collection=EwAtC1IWzhY3Ww https://www.twitch.tv/videos/1277407565?collection=EwAtC1IWzhY3Ww&t=00h00m52s https://player.twitch.tv/?collection=EwAtC1IWzhY3Ww&video=1277407565&parent=www.example.com https://player.twitch.tv/?collection=EwAtC1IWzhY3Ww&video=1277407565&time=0h2m27s&parent=www.example.com https://www.twitch.tv/p/giftcard/ https://www.twitch.tv/p/about https://www.twitch.tv/p/en/about/ https://blog.twitch.tv/ https://blog.twitch.tv/en/ https://blog.twitch.tv/en/archive/2023/ https://dev.twitch.tv/ https://dev.twitch.tv/products/ https://www.twitch.tv/downloads https://www.twitch.tv/jobs https://www.twitch.tv/jobs/en/ https://www.twitch.tv/turbo https://www.twitch.tv/store https://www.twitch.tv/creatorcamp https://www.twitch.tv/creatorcamp/en/paths/ https://www.twitch.tv/settings/security https://link.twitch.tv/devchat https://affiliate.twitch.tv/ https://meetups.twitch.tv/ https://meetups.twitch.tv/events https://help.twitch.tv/ https://help.twitch.tv/s/article/getting-started-twitch-studio https://www.twitch.tv/giftcard/buy?ref_=gc_twitch_landing https://www.twitch.tv/redeem https://safety.twitch.tv/ https://safety.twitch.tv/s/article/Usernames https://devstatus.twitch.tv/ https://devstatus.twitch.tv/uptime https://www.twitch.tv/broadcast/studio https://brand.twitch.tv/ https://brand.twitch.tv/downloads/twitch-brand-assets.zip https://www.twitch.tv/partner/signup https://www.twitch.tv/bits https://www.twitch.tv/prime https://sings.twitch.tv/ https://music.twitch.tv/` for i, match := range re.FindAllString(str, -1) { fmt.Println(match, "found at index", 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 Golang, please visit: https://golang.org/pkg/regexp/