Tool

Regex Tester

Type a pattern and see the matches in the text instantly. Capture groups are listed in a table, and you can preview the replacement too.

Runs in your browser — no data is sent to the server.

Pattern

Test text

Meeting on 2026-09-13, deadline 2026-10-01.
Invalid examples: 2026-9-1, 20260913.

Replace $1, $<name>, $& (whole match) can be used.

Matches

Your browser's JavaScript (ECMAScript) regex engine is used: (?<name>…) named groups, (?<=…) lookbehind and \p{L} (u ) are supported.
Matching runs in a separate Web Worker. If it does not finish in 1 second it is stopped, so patterns such as (a+)+$ that hit catastrophic backtracking cannot lock the page.
Up to 5,000 matches are found; the table shows the first 200.