Regular Expressions 101

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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

Substitution

Processing...

Code Generator

Language

Generated Code

// include the latest version of the regex crate in your Cargo.toml extern crate regex; use regex::Regex; fn main() { let regex = Regex::new(r"(?m)(?:github.com)(.*)").unwrap(); let string = "# [JSBox ](https://github.com/axelburks/JSBox?files=1) script / [Extract Scheme](https://github.com/axelburks/JSBox/tree/master/Extract%20Scheme) [over 1 year ago](https://github.com/axelburks/JSBox/tree/master/Extract%20Scheme) [Launcher](https://github.com/axelburks/JSBox/tree/master/Launcher) [over 1 year ago](https://github.com/axelburks/JSBox/tree/master/Launcher) [Magic Launcher](https://github.com/axelburks/JSBox/tree/master/Magic%20Launcher) [8 months ago](https://github.com/axelburks/JSBox/tree/master/Magic%20Launcher) [Schedule Message](https://github.com/axelburks/JSBox/tree/master/Schedule%20Message) [over 1 year ago](https://github.com/axelburks/JSBox/tree/master/Schedule%20Message) [XPin](https://github.com/axelburks/JSBox/tree/master/XPin) [3 days ago](https://github.com/axelburks/JSBox/tree/master/XPin) [iTunes Utilities](https://github.com/axelburks/JSBox/tree/master/iTunes%20Utilities) [6 months ago](https://github.com/axelburks/JSBox/tree/master/iTunes%20Utilities) [Boom.js](https://github.com/axelburks/JSBox/blob/master/Boom.js) [almost 2 years ago](https://github.com/axelburks/JSBox/blob/master/Boom.js) [Clip Editor.js](https://github.com/axelburks/JSBox/blob/master/Clip%20Editor.js) [about 1 year ago](https://github.com/axelburks/JSBox/blob/master/Clip%20Editor.js) [Downloader.js](https://github.com/axelburks/JSBox/blob/master/Downloader.js) [over 1 year ago](https://github.com/axelburks/JSBox/blob/master/Downloader.js) [Emoji.js](https://github.com/axelburks/JSBox/blob/master/Emoji.js) [almost 2 years ago](https://github.com/axelburks/JSBox/blob/master/Emoji.js) [IPA Installer.js](https://github.com/axelburks/JSBox/blob/master/IPA%20Installer.js) [about 2 months ago](https://github.com/axelburks/JSBox/blob/master/IPA%20Installer.js) [Installer.js](https://github.com/axelburks/JSBox/blob/master/Installer.js) [over 1 year ago](https://github.com/axelburks/JSBox/blob/master/Installer.js) [Pushbullet.js](https://github.com/axelburks/JSBox/blob/master/Pushbullet.js) [about 1 year ago](https://github.com/axelburks/JSBox/blob/master/Pushbullet.js) [README.md](https://github.com/axelburks/JSBox/blob/master/README.md) [about 2 months ago](https://github.com/axelburks/JSBox/blob/master/README.md) [SM.MS.js](https://github.com/axelburks/JSBox/blob/master/SM.MS.js) [over 1 year ago](https://github.com/axelburks/JSBox/blob/master/SM.MS.js) [Shorten.js](https://github.com/axelburks/JSBox/blob/master/Shorten.js) [about 1 year ago](https://github.com/axelburks/JSBox/blob/master/Shorten.js) [Thunder.js](https://github.com/axelburks/JSBox/blob/master/Thunder.js) [about 1 year ago](https://github.com/axelburks/JSBox/blob/master/Thunder.js) [Tool Box play_icon.png](https://github.com/axelburks/JSBox/blob/master/Tool%20Box%20play_icon.png) [almost 2 years ago](https://github.com/axelburks/JSBox/blob/master/Tool%20Box%20play_icon.png) [Tool Box.js](https://github.com/axelburks/JSBox/blob/master/Tool%20Box.js) [over 1 year ago](https://github.com/axelburks/JSBox/blob/master/Tool%20Box.js) [Weico.js](https://github.com/axelburks/JSBox/blob/master/Weico.js) [almost 2 years ago](https://github.com/axelburks/JSBox/blob/master/Weico.js) [XQRcode.js](https://github.com/axelburks/JSBox/blob/master/XQRcode.js) [about 1 year ago](https://github.com/axelburks/JSBox/blob/master/XQRcode.js) [updateInfo](https://github.com/axelburks/JSBox/blob/master/updateInfo) [over 1 year ago](https://github.com/axelburks/JSBox/blob/master/updateInfo) [version.json](https://github.com/axelburks/JSBox/blob/master/version.json) [about 2 months ago](https://github.com/axelburks/JSBox/blob/master/version.json) "; let substitution = ""; // result will be a String with the substituted value let result = regex.replace_all(string, substitution); println!("{}", result); }

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 Rust, please visit: https://docs.rs/regex/latest/regex/