Developer Tools

Regex Tester

Enter a regex pattern, choose flags, paste test text, and inspect readable match results instantly. This page is useful for validation rules, parsing tasks, search patterns, and debugging expressions.

Test Regular Expressions Online

Test regular expressions online with pattern, flags, test text, and readable match results.

Pattern

Flags

Test text

Match result

Valid regular expression

Pattern: /\b[a-z0-9._%+-]+@[a-z0-9.-]+\.[a-z]{2,}\b/gi
Matches found: 3

Match 1: "hello@example.com"
Index: 14

Match 2: "support@onlinefileconverter.org"
Index: 35

Match 3: "admin@example.net"
Index: 99

Enter a pattern, flags, and test text to inspect matches.

Why Use This Regex Tester

Test regular expressions with flags such as g, i, and m
Inspect match values, indexes, and named groups
Use sample input for quick experiments
Copy the result as plain text

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Frequently Asked Questions

How do I use this regex tester?

Enter a regex pattern, optionally add flags such as g or i, paste test text, and run the tester to inspect the matches.

Does the regex tester show invalid patterns?

Yes. Invalid patterns or unsupported flags return a clear error message instead of match output.

Is this regex tester free?

Yes. It is free to use in your browser.