DevVault
100% on-device
Regex tester
Test a pattern against real text with live highlighting, a table of capture groups and a replacement preview. Patterns run in a worker on a time budget, so catastrophic backtracking cannot lock up the page.
Runs entirely in this tab. What you paste is never sent anywhere.
//gm
Test string
Paste, type, or drop a file (txt, log, csv).
Matches
Nothing to match against yet.
Patterns run in a Web Worker with a 800ms budget. A regular expression cannot be interrupted once the engine starts, so a catastrophic one is escaped by terminating the whole thread — the page stays responsive either way.