- URIs:
+ As defined in RFC 1738.
+ More of them.
- Dates:
+ localtime dates.
+ ISO Dates.
+ An inverse of strftime?
- numbers:
+ Decimal numbers (e.g. 7.5, 0.3, .99, 15, but not 1.23E5).
+ Roman numbers >= 4000. Unicode?
+ Prime numbers? Fibonacci? Other special numbers?
+ Ranges of numbers.
- postal codes.
+ Lots more, especially British and Canadians.
- Email addresses.
+ RFC 822/2822.