{"content":"This challenge combines extremely complex patterns that would require sophisticated regex techniques to match accurately:\n1. Nested JSON structures with escaped quotes and special characters\n2. Email addresses with unusual formats (quotes, IPv6, comments)\n3. Timestamps with fractional seconds and timezone offsets in various formats\n4. URLs with special characters, authentication, and query parameters\n5. Version numbers with build metadata\n6. Semantic versioning with pre-release identifiers\n7. Base64 encoded data with valid padding\n8. Product codes with tricky distinctions\n9. Phone numbers with extensions and international formats\n10. Similar but distinct patterns that would require negative lookaheads/lookbehinds\n\nThe text includes both target items and very similar non-target items that would confuse naive matching approaches. A successful matcher would need to handle complex escaping, proper nesting, and precise pattern boundaries.","function_call":{"name":"ma... (truncated)