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Regex tester

Highlight the matching parts of a string using a regex pattern and flags. Free, nothing sent.

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Regular expression (regex) tester

With a regex pattern and flags (g, i, m, etc.), find in the stringHighlight matchesand shows the result.
Uses JavaScript regex syntax. Runs in your browser only.

What is Regex Tester?

A tool that takes a regular-expression pattern, highlights the matches in text, and shows the match count. Use it to write and verify patterns.

How it works

1 Enter the regex pattern and the target text.
2 Check the highlighted matches and the match count.

Frequently Asked Questions

Do flags (g, i, etc.) work? ⌄

You can apply options such as case-insensitive and global search.

Is it checked in real time? ⌄

Match results update the moment you type.

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