{"claude_md":"# Regex Playground\n\nInteractive regex tester with live match highlighting, named group extraction, and a library of common patterns. Pre-loaded with email, URL, UUID, and date patterns.\n\n## Quick Reference\n\n# Regex Playground\n\n> **Purpose:** A live, interactive regular expression tester. Type a pattern on the left and watch matches highlight in the test string in real time. Includes named group extraction, match count, a library of common presets, and flag toggles (g, i, m, s).\n\n---\n\n## How to Use\n\n1. **Type a pattern** in the `/pattern/` input at the top\n2. **Toggle flags** — `g` (global), `i` (case-insensitive), `m` (multiline), `s` (dotAll)\n3. **Edit the test string** — paste any text to test against\n4. **Click a preset** in the right panel to load a common pattern instantly\n\n---\n\n## Preset Patterns Included\n\n| Preset | Pattern matches |\n|--------|----------------|\n| Email | Standard email addresses |\n| URL | HTTP and HTTPS URLs |\n| UUID | RFC 4122 UUIDs |\n| Hex Color | CSS hex colors (#fff, #7c3aed) |\n| ISO Date | YYYY-MM-DD date strings |\n| IP Address | IPv4 addresses |\n| Phone (US) | US phone numbers with country code |\n| Markdown Link | `[text](url)` link syntax |\n\n---\n\n## Reading Results\n\n- **Purple highlight** — a match in the test string\n- **Brighter purple** — the first match\n- **Match list** — shows each match text and its character index\n- Named capture groups are shown in the match list as `groups: {name: value}`\n\n---\n\n## Common Flags\n\n| Flag | Meaning |\n|------|---------|\n| `g` | Global — find all matches, not just the first |\n| `i` | Case-insensitive match |\n| `m` | Multiline — `^` and `$` match line boundaries |\n| `s` | Dotall — `.` matches newlines |\n\n\n## Agent Docs (read when relevant)\n\n| File | When to read |\n|------|-------------|\n| `agent_docs/regex-playground.html` | regex playground |\n","agent_docs":{"agent_docs/regex-playground.html":"\n\n\n\nRegex Playground\n\n\n\n