Which regex flavor is used?

Native JavaScript regular expressions - the same engine your browser runs, so results match your production code.

What flags are supported?

All JS flags: g, i, m, s, u, and y - enter them in the flags field.

Why do I see "no matches"?

Check escaping (backslashes in patterns), the global flag for multiple matches, and that the test string contains what you expect.

Regex Tester - Live Matches & Highlighting

Test JavaScript regular expressions with instant match highlighting and a full match list.

Debug Regular Expressions at the Speed of Typing

One misplaced bracket and a regex matches nothing - or everything. AiLoveKit's regex tester highlights every match live as you edit the pattern or test string, lists match indices, and supports all JavaScript flags. It runs on the exact engine your web app uses, so what you see here is what ships.

Tester Features

Live highlighting - matches glow as you type.
Match list - index and content of every hit.
Flag controls - global, ignore-case, multiline, dotAll, unicode, sticky.

Regex Tester - Live Matches & Highlighting

Debug Regular Expressions at the Speed of Typing

Tester Features

Frequently Asked Questions