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

/
/
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)<bean id=.*processName"\s*value="([a-zA-Z0-9\.]*).*processVersion"\s*value="([0-9\.]*)".*<\/bean>"#).unwrap(); let string = "<bean id=\"AuthenticationServicePDCAdapter\" class=\"br.com.bradesco.web.crur.service.data.pdc.authenticationservice.AuthenticationServicePDCAdapterImpl\" parent=\"PDCAdapterAbstract\" abstract=\"false\" singleton=\"true\" lazy-init=\"true\" autowire=\"default\" dependency-check=\"default\"> <property name=\"group\" value=\"INTRANET\"/> <property name=\"description\" value=\"Insert description here\"/> <property name=\"processName\" value=\"intranet.framework.logon\"/> <property name=\"processVersion\" value=\"1.0.9\"/> <property name=\"adapterPackage\" value=\"br.com.bradesco.web.crur.service.data.pdc\"/> <property name=\"processProduct\" value=\"Intranet\"/> <property name=\"isLoginRequired\" value=\"false\"/> <property name=\"baseClassRequestName\" value=\"LogonRequest\"/> <property name=\"baseClassResponseName\" value=\"LogonResponse\"/> <property name=\"factoryId\" value=\"factoryAdapter\"/> <property name=\"factoryPackage\" value=\"br.com.bradesco.web.crur.service.data.pdc\"/> <property name=\"factoryClassName\" value=\"FactoryAdapter\"/> <property name=\"isNewAwbFrameworkVersion\" value=\"true\"/> <property name=\"pdcConnector\" ref=\"${pdc.connector}\"/> </bean> "; let substitution = "$1-$2"; // 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/