Regex Tester

Write a pattern and see matches highlighted as you type. Uses the JavaScript regex engine.

Regular expression

/ /g

Test string

Matches

0 matches

Match details

Replace

Quick reference

\d digit · \w word character · \s whitespace · . any character
* 0 or more · + 1 or more · ? optional · {2,5} between 2 and 5
^ start · $ end · \b word boundary
(…) capture group · (?<name>…) named group · (?:…) non-capturing
(?=…) lookahead · (?<=…) lookbehind

Replacement tokens

$1, $2… insert numbered groups. $<name> inserts a named group, $& the whole match.