regex for zip-code

Question

Possible Duplicate:
What is the ultimate postal code and zip regex?

I need Regex which can satisfy all my three condtions for zip-code. E.g-

1. 12345
2. 12345-6789
3. 12345 1234

Any pointers and suggestion would be much appreciated. Thanks !

Answer 1

^d{5}(?:[-s]d{4})?$

• ^ = Start of the string.
• d{5} = Match 5 digits (for condition 1, 2, 3)
• (?:…) = Grouping
• [-s] = Match a space (for condition 3) or a hyphen (for condition 2)
• d{4} = Match 4 digits (for condition 2, 3)
• …? = The pattern before it is optional (for condition 1)
• $ = End of the string.