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

/
/
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)(?i)<label id="\{[\d\w-]+}">([a-z ]+)<\/label>"#).unwrap(); let string = "<p> <title>Contact Us</title> </p> <table dropzone=\"copy\"> <tbody> <tr> <td class=\"label\" style=\"cursor: default;\">Full Name</td> <td style= \"cursor: default;\">[<label id=\"{0a4a7240-9606-416a-bf7b-ef11a47cca8e}\">First name</label>] [<label id=\"{94263497-683b-46f9-ba0f-69f4c2736598}\">Last name</label>]</td> </tr> <tr> <td class=\"label\" style=\"cursor: d efault;\">Telephone</td> <td style=\"cursor: default;\">[<label id=\"{ce68e02e-e9fd-40ee-9375-ee1b05972e9b}\">Phone</label>]</td> </tr> <tr> <td class=\"label\" style=\"cursor: default;\">Email</td> <td style=\"cursor: default;\">[<label id=\"{411b580e-f7e9-4dd2-a70d-947385360cd0}\">Email</label>]</td> </tr> <tr> <td class=\"label\" style=\"cursor: default;\">Message</td> <td style=\"cursor: default;\">[ <label id=\"{13e2ff23-135c-4c6d-beb4-2960a533cb98}\">Your Message</label>]</td> </tr> <tr> <td class=\"label\" style=\"cursor: default;\">Company</td> <td style=\"cursor: default;\">[<label id=\"{c3f22c3a-8fc1 -48a4-8d6a-fe346024ca2b}\">Company</label>]</td> </tr> </tbody> </table> <p> </p> <p> </p>"; let substitution = "$1"; // 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/