About Regex Hut

Regex Hut is a free online regular expression tester and debugger with live match highlighting, replace preview and plain-English explanations.

What you can do on Regex Hut

• Live Match Highlighting – Test a pattern against sample text with the g, i, m, s and u flags.
• Match Details – See every match with its position and capture groups.
• Replace Preview – Try out substitutions before you use them in code.
• Pattern Library – Start from ready-made patterns for emails, URLs, dates and more.
• Pattern Explainer – Break a regular expression down into plain-English pieces.
• Share Links – Copy a link that reopens your pattern, flags and test text.

Open the Regex Tester & Debugger

How it works

• Free to use: no account, sign-up or payment is required.
• Patterns and test text are evaluated with your browser's own JavaScript regex engine. They are not sent to our servers.
• Works in modern desktop and mobile browsers, with nothing to install.
• The interface is available in English and Chinese.
• The site is supported by advertising, which keeps every tool free.

Who runs Regex Hut

Regex Hut is an independent project run by a solo developer. The goal is simple: fast, uncluttered tools that respect your privacy, open instantly and never ask you to register.

Why we built it

Regular expressions are powerful but hard to read, and a small mistake can silently match the wrong text. Regex Hut highlights matches the moment you type and explains each part of a pattern, so you can debug an expression before it goes into production code.

Feedback

Found a bug, have an idea for a new feature or spotted something that could be clearer? We read every message; please get in touch through our Contact page.