regex101
regex101.comBuild, test, and debug regular expressions with ease
Dev Toolsregexdeveloper-toolstestingdebuggingsyntax-highlightingopen-source
About
regex101 is an online regular expression tester and debugger supporting multiple flavors including PHP/PCRE, Python, Go, JavaScript, Java, C#/.NET, and Rust. It provides syntax highlighting, real-time match explanations, a reference cheat sheet, and tools for building and validating regex patterns. The platform also offers a commercial regex parser, enterprise self-hosting, and a Pro benchmarking workflow.
Problem
Developers struggle to write, test, and debug regular expressions efficiently across different programming languages and flavors.
For
software developers
How it works
Users enter a regex pattern and test string in the browser-based editor, which provides real-time syntax highlighting, match details, and an auto-generated explanation of the pattern.
Business model
freemium
Status
launched