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RegExr

Learn, Build, & Test Regular Expressions online

Dev Toolsregexdeveloper-tooljavascriptphppcretestingopen-source
RegExr screenshot

About

RegExr is a web-based tool for writing, testing, and learning regular expressions. It supports JavaScript and PHP/PCRE regex engines with real-time match highlighting, a full reference cheat sheet, and contextual help. Users can save and share expressions and browse a searchable library of community-contributed patterns.

Problem

Writing and debugging regular expressions is difficult without immediate visual feedback and reference material.

For

software developers and anyone learning or working with regular expressions

How it works

Users type a regex and test string into an online editor that highlights matches in real time, with contextual explanations, a cheat sheet, and community patterns available alongside.

Business model

free

Status

launched

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