The pattern is built using alternation (|) to match each specific category:
1. Email addresses: Escaped special characters and matched exact patterns
2. IDs: Three capital letters, followed by -123/-456/-789 and specific lowercase letters
3. Phone numbers: Both standard XXX-XXX-XXXX and custom XXX-XX-XX-XX formats
4. Dates: Matches the specific date formats with different separators (/./-)
5. Currency amounts: Matches specific amounts with currency symbols
6. Quoted names: Matches the exact quoted strings
7. Custom tags: Escaped special characters in XML-like tags and matched nested structure

Using groups and alternation ensures we match exactly these patterns and nothing else.