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

/
/

Test String

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"<script[^>]+>[\s|\S]*('facebook-jssdk'\)\); \/\/ ]]><\/script>)").unwrap(); let string = "<p><em>ขอขอบคุณข้อมูลจาก <a href=\"https://www.facebook.com/CrewabsCabincrew/photos/a.163266007065328.35057.162290157162913/981295968595657/?type=3\">เฟซบุ๊ก Crewabs Cabincrew</a></em></p> <script type=\"text/javascript\"></script>asdasd asdasdasd asdad <script type=\"text/javascript\">// <![CDATA[ (function(d, s, id) { var js, fjs = d.getElementsByTagName(s)[0]; if (d.getElementById(id)) return; js = d.createElement(s); js.id = id; js.src = \"//connect.facebook.net/th_TH/sdk.js#xfbml=1&version=v2.3\"; fjs.parentNode.insertBefore(js, fjs);}(document, 'script', 'facebook-jssdk')); // ]]></script> <div class=\"fb-post\" data-href=\"https://www.facebook.com/CrewabsCabincrew/photos/a.163266007065328.35057.162290157162913/981295968595657/?type=3\" data-width=\"500\"> <div class=\"fb-xfbml-parse-ignore\"> <blockquote cite=\"https://www.facebook.com/CrewabsCabincrew/photos/a.163266007065328.35057.162290157162913/981295968595657/?type=3\"> <p>จากใจแอร์สาวบนไฟล์ทที่โดนหนุ่มรถไฟจีบด้วยมุก\"ระเบิด\"กรณีหนุ่มรถไฟ แซวแอร์ไทยไลอ้อน อยากขอพื้นที่ชี้แจงให้ลูกเรือสาวในไ...</p> Posted by <a href=\"https://www.facebook.com/CrewabsCabincrew/\">Crewabs Cabincrew</a> on&nbsp;<a href=\"https://www.facebook.com/CrewabsCabincrew/photos/a.163266007065328.35057.162290157162913/981295968595657/?type=3\">3 พฤศจิกายน 2015</a></blockquote> </div> </div> </div> </div>"; // result will be a tuple containing the start and end indices for the first match in the string let result = regex.captures(string); let (start, end) = match result { Some((s, e)) => (s, e), None => { // ... } }; println!("{}", &string[start, end]); }

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/