Regex Tester

Regex Tester runs JavaScript regular expressions against your test string in real time. Toggle the standard flags (g, i, m, s, u, y), view every match with its position, and inspect capture groups individually. Useful for prototyping a pattern before pasting into code, debugging why a regex isn't matching what you expected, and learning how flags change behavior. Runs in your browser — no upload, no telemetry.