Regex Tester

Free online Regex Tester. No sign-up needed, and it runs in your browser.

Processed on your device

Test JavaScript regular expressions live: see every match highlighted, the capture groups, and a replace preview.

Cheat sheet (click to insert)
\d digit
\w letter, digit or _
\s space, tab or newline
. any character
[abc] a, b or c
[^abc] not a, b or c
^ start of line
$ end of line
* 0 or more
+ 1 or more
? optional
{2,5} 2 to 5 times
(…) group
(?<name>…) named group
a|b a or b
\b word boundary

How to use

  1. Add your text or file.
  2. Adjust the options if needed.
  3. Copy or download the result.