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Regex Tester - Test Regular Expressions Online Free | The MuffinPost
Free Developer Tool

Regex Tester

Test regular expressions online instantly. Enter a pattern, choose flags, highlight matches and inspect results directly in your browser.

Regex Status Enter a regular expression and test text

Highlighted Text

Matched text will appear highlighted here.

Matches

Match list will appear here.
0Matches
0Groups
giFlags

How to Test a Regex

Check your regular expression pattern in three simple steps.

1. Enter pattern

Paste or type your regular expression without slash delimiters.

2. Add test text

Paste the text where you want to find matches.

3. Review matches

See highlighted matches, match count and captured groups.

Debug JavaScript regular expressions faster.

This Regex Tester helps developers validate patterns, inspect matches, test flags, find captured groups and debug text matching directly in the browser.

✅ Test JavaScript regex online
✅ Highlight all matches
✅ Supports common regex flags
✅ Copy matched results instantly

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Regex Tester FAQ

Common questions about testing regular expressions online.

What is a regex tester?

A regex tester helps you check a regular expression pattern against sample text and see what it matches.

Which regex flavor does this tool use?

This tool uses JavaScript regular expressions because it runs directly in your browser.

Can I test regex flags?

Yes. You can test common JavaScript flags such as g, i, m, s, u and y.

Is this Regex Tester free?

Yes. This online Regex Tester is free to use.