Build a regex generator and debugging tool for developers. Core features: 1. A natural language input: describe the pattern ('match US phone numbers with optional country code') and get a working regex. 2. A live test panel where sample text is highlighted in real time as the regex changes. 3. An AI explainer that breaks the pattern down token by token in plain English. 4. A library of common patterns (emails, URLs, dates, phone numbers, hex colors) that users can fork and edit. 5. A regex flavor selector for JavaScript, Python, and PCRE so the output matches the user's language. 6. Debug assistance: paste a broken regex and sample text, and the AI explains why it fails and proposes a fix. 7. Saved test suites with names and shareable permalinks. 8. Copy buttons and a usage snippet showing the regex in context for the selected language.