Regex Match Lab

Build, test and reuse regular expressions without sending your text anywhere. See matches as you edit. Inspect numbered capture groups and exact UTF-16 ranges. Review highlighted source and a compact match map, then preview replacements using $1, $2 or named groups. Start with email, log and date examples. Toggle ignore-case, per-line anchors and dot-matches-newline options. Save named tests on your device, search and update them, reopen your draft, or import and export test archives. Share or export a plain-text report when you choose. A native workbench for Android phones and tablets, with light and dark appearance and 10 interface languages. All features are included in the app purchase. No subscription, account, ads, analytics or network connection. Uses Android's regular-expression engine. Advanced syntax and Unicode behavior can differ from Apple, JavaScript and PCRE. Ranges count UTF-16 units. Previews are limited to 20,000 UTF-16 units, 500 match rows and 32 capture groups. Long-running evaluations stop after 1.5 seconds; replacement preview is limited to 60,000 units. Tests and drafts remain on this device unless you choose to export or share.