Live pattern matching with capture groups built in ~6 minutes.
Build a live regex tester in React with: - Pattern input, flag toggles (g, i, m, s), and test string textarea - Parse with new RegExp, catch errors, show a red error message when invalid - Render the test string with every match highlighted in-place (purple background) - List matches below with index and capture groups - A few preset patterns (email, URL, hex color) with one-click load - Dark UI, no external dependencies