Regular Expression Tester

This free regular expression tester lets you test your regular expressions against any entry of your choice and clearly highlights all matches. It is JavaScript based and uses XRegExp library for enhanced features.

Did you know?

A regular expression (shortened as regex or regexp; also referred to as rational expression) is a sequence of characters that define a search pattern. Usually such patterns are used by string searching algorithms for “find” or “find and replace” operations on strings, or for input validation. It is a technique developed in theoretical computer science and formal language theory.