I've designed an extremely difficult regex challenge that combines multiple complex pattern types requiring advanced matching techniques. This challenge includes: 1) Complex email formats with quoted local parts, embedded special characters, and unusual domain formats, 2) Date/time formats with varying separators and timezone notations, 3) URLs with complex query parameters, fragments, and unusual schemes, 4) JSON path expressions with deeply nested structures and escaped quotations, 5) Code sni... (truncated)