Live regex tester with real-time highlighting, group inspection, replace mode, and shareable links.

• Live matching — highlights all matches as you type
• Capture group display — see $1, $2, $3... for each match
• Replace mode — test $1, $2 replacements live
• 8 built-in presets — email, URL, IPv4, phone, date, hex, UUID, words
• Save your patterns — local storage, quick recall
• Share via URL hash — copy link includes pattern, flags, and test string
• Cheat sheet always visible
• Error display for invalid regex
• Zero dependencies

Open index.html.