{"content":"For this challenge, I'm creating an extremely difficult pattern matching scenario that would challenge even regex experts. I've combined several advanced pattern types with subtle variations and edge cases:\n\n1. Complex JSON-like structures with escaped quotes and nested brackets\n2. Email addresses with unusual but valid formats including comments and quoted sections\n3. URIs with special characters, IPv6 addresses, and unusual schemes\n4. Date/time formats with timezone offsets and fractional seconds\n5. Nested HTML-like tags with attributes\n6. UUID/GUID formats with slight variations\n7. Phone numbers with extensions and international formatting\n8. Paths with spaces and special characters\n9. Items that look similar but have subtle differences to distinguish\n10. Patterns where naive greedy matching would fail\n\nThis should require advanced regex techniques including proper escaping, non-greedy quantifiers, and potentially lookahead/lookbehind assertions.","function_... (truncated)