What regex flavor is used?

This uses JavaScript's native RegExp engine, the same one used in browsers and Node.js.

Can I see capture groups?

Yes, each match's capture groups are listed alongside the full match text.

Is my test text sent anywhere?

No, all matching happens instantly and locally in your browser.

Processed 100% locally in your browser

Regex Tester

Test regular expressions with live match highlighting and capture group inspection — 100% local.

Quick Answer

Regex Tester lets you: Test regular expressions with live match highlighting and capture group inspection — 100% local. To start, type a regular expression pattern.

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How to use this tool

1
Enter your pattern
Type a regular expression pattern.
2
Set flags
Toggle global, ignore case, multiline, or dot-all flags.
3
Add test text
Paste or type the text you want to test the pattern against.
4
Review matches
Matches are highlighted live, with a full list of matches and capture groups.

Frequently Asked Questions

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CSV to JSON

Convert between CSV and JSON formats instantly, in both directions — processed 100% locally.

Regex Tester

How to use this tool

Enter your pattern

Set flags

Add test text

Review matches

Frequently Asked Questions

What regex flavor is used?

Can I see capture groups?

Is my test text sent anywhere?

Related Tools

JSON Formatter

CSV to JSON

Regex Tester

How to use this tool

Enter your pattern

Set flags

Add test text

Review matches

Frequently Asked Questions

What regex flavor is used?

Can I see capture groups?

Is my test text sent anywhere?

Related Tools

JSON Formatter

CSV to JSON