This tool needs JavaScript. Everything it does runs in your browser and nothing is sent to a server, so with JavaScript switched off it cannot calculate, generate or draw anything.

Regex Tester

Test a JavaScript regular expression against your own text, see every match and capture group highlighted, and preview a replacement. Nothing is uploaded.

Pattern

/ /

Test text

0 matches

Replace Replacement

Matches 0

No matches yet.

Explanation

Patterns run through the browser's own regular expression engine, so behaviour matches JavaScript exactly. Other flavours differ: PCRE, Python and Go have lookbehind and named group syntax of their own.