Dev Tool

Regular Expression Tester

Write regular expressions, test them against live text, and instantly see matches and capture groups highlighted.

RegExp Tester

Configuration

//

Live Result

Hello world! 123 Testing RegExp.

Match Information4

  • Match #1
    Hello
  • Match #2
    world
  • Match #3
    Testing
  • Match #4
    RegExp

What is a Regular Expression (RegExp)?

A regular expression is a sequence of characters that specifies a search pattern. It is used for string validation, searching, and replacing text. Our tester uses the JavaScript engine (ECMAScript) to execute regex patterns directly in your browser.