This single alternation pattern matches exactly the listed items. It includes a strict email subpattern (requiring a TLD), three date forms (YYYY/ MM/ DD, DD-MMM-YYYY, DD/ MM/ YYYY), a comprehensive IPv6 subpattern (covering all variations with and without ::), color functions (rgb, rgba, hsl), and exact literal matches for the three nested expressions. Everything is wrapped in one alternation so only those exact items will match and nothing else.