Lookaheads, lookbehinds, backreferences, and complex patterns
Positive and negative lookaheads/lookbehinds (?=) (?!) (?<=) (?<!)
Referencing captured groups with \1, \2, \k<name>
Using (?<name>pattern) for better readability
If-then-else logic in regex patterns
Preventing backtracking with (?>pattern)
Optimizing regex patterns for speed and efficiency
Build sophisticated patterns for real-world challenges