Regular Expressions 101

Save & Manage Regex

  • Current Version: 1
  • Save & Share
  • Community Library

Flavor

  • PCRE2 (PHP)
  • ECMAScript (JavaScript)
  • Python
  • Golang
  • Java
  • .NET 7.0 (C#)
  • Rust
  • PCRE (Legacy)
  • Regex Flavor Guide

Function

  • Match
  • Substitution
  • List
  • Unit Tests
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
Processing...

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)<slot-configuration slot-id="refinebar-slot-content" context="category" context-id="(.*)" configuration-id="(.*?)"( default="(?:.*)?")? assigned-to-site="(.*)">\s*<template>(.*)<\/template>\s*<enabled-flag>(.*)<\/enabled-flag>\s*<content>\s*<content-assets>(\s*<content-asset content-id=".*"\/>)*\s*<content-asset content-id="(seo-.*)"\/>\s*(?:<content-asset content-id=".*"\/>\s*)*<\/content-assets>\s*<\/content>(\s*<customer-groups>(?:\s*<customer-group group-id=".*"\/>)+\s*<\/customer-groups>|.*)?\s*<\/slot-configuration>"#).unwrap(); let string = " <slot-configuration slot-id=\"refinebar-slot-content\" context=\"category\" context-id=\"sport-garcon\" configuration-id=\"seo-boutique-sport-garcon-2\" default=\"true\" assigned-to-site=\"true\"> <template>slots/content/htmljustcontent.isml</template> <enabled-flag>true</enabled-flag> <content> <content-assets> <content-asset content-id=\"seo-boutique-bbf-2\"/> <content-asset content-id=\"account-menu-content-management\"/> <content-asset content-id=\"seo-boutique-sport-garcon\"/> </content-assets> </content> </slot-configuration> "; let substitution = "$0 <slot-configuration slot-id=\"mobile-refinebar-slot-content\" context=\"category\" context-id=\"$1\" configuration-id=\"$2-mobile\"$3 assigned-to-site=\"$4\"> <template>$5</template> <enabled-flag>$6</enabled-flag> <content> <content-assets> <content-asset content-id=\"$8\"/> </content-assets> </content>$9 </slot-configuration>"; // 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/