Is Mirown Regex Tester free?

Yes. Mirown Regex Tester is free to use with no sign up or login required.

Does this developer tool upload my code?

This tool is built as a browser-first page. The visible formatting, minifying, testing, copying, and local history workflows run in the browser without account login or upload-based storage.

Can I use the output in production?

You can use the output as a helpful starting point, but you should review and test important code before using it in production.

Does this work on mobile?

Yes. The developer tool layout is responsive. Larger code editing work is usually easier on tablet, laptop, or desktop screens.

Developer Tools

Regex Tester

Free Regex Tester with flags, highlighted matches, match count, positions, capturing groups, errors, explanation panel, copy regex, clear, and recent patterns. No sign up required.

Free browser developer tool

Regex Tester

Test regular expressions against sample text, highlight matches, inspect capture groups, and keep recent patterns in your browser.

Regex pattern

Mirown developer tools help format JSON, minify CSS, test regular expressions, and preview useful code output.

Common token guide

\\d digit
\\w word character
\\s whitespace
+ one or more
* zero or more
? optional
() capturing group
[] character set
^ line start
$ line end

Recent patterns

Ready. Test regex patterns with JavaScript regex behavior.

Buy me a coffee

Mirown is free to use, if this tool saves your time

Free developer tool

Use the free Regex Tester online with no sign up or login required.

Test regular expressions against sample text, highlight matches, inspect capture groups, and keep recent patterns in your browser. Mirown keeps developer pages practical: fast static pages, clear controls, readable output, and no unnecessary account wall.

How to use this tool

Open the free Mirown Regex Tester page in your browser.
Paste code, text, JSON, CSS, HTML, JavaScript, or regex test content into the visible editor.
Use the format, minify, validate, test, preview, copy, or download controls for the task.
Check the output, errors, warnings, stats, or match details before using the result in real work.

What this free tool includes

Regex pattern input
Test text textarea
Flags for global, ignore case, multiline, dotAll, and unicode
Highlight all matches in test text
Match count and match positions
Capturing group display
Clear regex errors
Simple explanation panel for common tokens
Copy regex button
Clear button
Recent regex patterns saved in local storage
Free to use with no sign up or login required

Why this developer tool is useful

The Regex Tester helps with log parsing, form validation, text extraction, developer debugging, search pattern testing. It is useful when you need a quick check, cleanup, preview, minified file, or copied result without opening a heavy IDE workflow.

Privacy note

Mirown developer tools are browser-first and do not require sign up or login. Recent input is stored only in your own browser local storage when the tool supports it. Avoid pasting private production secrets, access tokens, or sensitive customer data into any website.

Accuracy note

Browser developer tools are convenience helpers. Minifiers, validators, formatters, previews, and regex tests should be reviewed before production use, especially when code is complex, security-sensitive, or business-critical.