I'm constructing an extremely complex text featuring multiple tricky elements – various email formats (with subdomains, special characters, repeated symbols), phone numbers with optional extensions, multiple date styles, backreferenced codes, repeated words, a full URL, and secret codes. The challenge will require advanced regex techniques including lookaheads, lookbehinds, capturing groups, and backreferences to correctly match only the intended target items while excluding similar but invalid ... (truncated)