Boring Regex Tester

Tests a JavaScript regex against text. Lists matches or replaces.

Input

Load file

Pattern

Flagsg i m s u y

Mode

ReplacementUse $1, $2, $& for groups.

Test JavaScript regular expressions live: see every match with index and capture groups, or run a replace.

Nothing is uploaded. This page makes no network requests with your data, and its Content-Security-Policy forbids them.

This tool is built from Sandbox blocks. Use “Take it apart” to change how it works.