I'm using alternation with the | operator to match each specific target string exactly. This approach ensures I match only the valid examples while avoiding the invalid ones mentioned in the text. I've carefully escaped special regex characters like parentheses, plus signs, and dots where needed.

The regex uses these techniques:
1. Exact string matching for each target
2. Proper escaping of special regex characters 
3. Alternation (|) to combine multiple patterns
4. Ordering from most specific to least specific patterns

This approach guarantees we match exactly what's needed without accidentally capturing invalid examples or partial matches.