This pattern uses alternation (|) to match exactly the 8 target items. I've carefully escaped all regex special characters including:
1. For the email with IPv6: Escaped brackets, dots, plus sign
2. For the phone number: Escaped parentheses, plus sign, dots
3. For the timestamp: Escaped colons, dots
4. For the URL: Escaped dots, hyphens, colons, slashes, question mark, ampersand, hash
5. For the quoted email: Escaped quotes, at symbol, dots
6. For the alphanumeric code: Escaped hyphens
7. For the regular email: Escaped underscore, dots
8. For the JSON: Escaped quotes, braces, brackets, colons, commas

Since we need to match each string exactly, I'm not using more general patterns. Each item in the alternation precisely matches its target string with all special characters properly escaped.