RegexLab: Regex Tester

RegexLab is a live regular-expression workbench for your iPhone and iPad: type a pattern, paste your test text, and watch matches light up as you type. SEE MATCHES INSTANTLY Every keystroke re-runs your pattern against the test text with live highlighting, a match count, and a list of every capture group — no run button, no waiting. REPLACE WITH CONFIDENCE Preview replacements with template support ($1, $2 and friends) before you commit them in your codebase. FLAGS AND CHEATSHEET BUILT IN Toggle case-insensitive, multiline, and dot-matches-newlines. A built-in cheatsheet covers the tokens everyone forgets, plus ready-made sample patterns for emails, URLs, phone numbers, and IP addresses. SAVE YOUR GOOD ONES Keep a library of patterns that took you twenty minutes to get right, so next time it takes zero. Everything runs on-device with no network access — your test data stays yours. No account, no ads, no subscription. Pay once.