Plexto

Regex Tester

NEW

Test regular expressions with live match highlighting.

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Frequently asked questions

Which regex flavor does this use?

JavaScript's regex engine — the same one used by browsers and Node.js. Syntax can differ slightly from PCRE (PHP/Python) or POSIX regex in some edge cases, like lookbehind support in older environments.

Why isn't my pattern matching anything?

The most common cause is a missing flag — add "g" to find every match instead of just the first, or "i" for case-insensitive matching.

Is my text or pattern sent to a server?

No — matching happens entirely in your browser as you type.

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