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One regex for checking US and Canada zip codes

I am developing a program for office supplies. Customers can choose their region both in the USA and in Canada. When they enter the address, they must enter the ZIP / Postal code. I am trying to check a field, but I cannot use reg exp for the USA or Canada. I need a regular expression that is checked for both the zip code of the country.

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2 answers

Not knowing which language you are using, I will not use abbreviations for character classes:

^[0-9]{5}$|^[AZ][0-9][AZ] ?[0-9][AZ][0-9]$

Depending on your language, you can shorten this to

 ^([0-9]{5}|[AZ][0-9][AZ] ?[0-9][AZ][0-9])$

or

 ^(\d{5}|[AZ]\d[AZ] ?\d[AZ]\d)$

To support ZIP + 4:

 ^(\d{5}(-\d{4})?|[AZ]\d[AZ] ?\d[AZ]\d)$

And if you want to really understand your Canada codes:

 ^(\d{5}(-\d{4})?|[A-CEGHJ-NPRSTVXY]\d[A-CEGHJ-NPRSTV-Z] ?\d[A-CEGHJ-NPRSTV-Z]\d)$
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In response to the above, you can add (? I) to the beginning of the regular expression to make case insensitive. So it will look like this:

 ^(?i)(\d{5}(-\d{4})?|[A-CEGHJ-NPRSTVXY]\d[A-CEGHJ-NPRSTV-Z] ?\d[A-CEGHJ-NPRSTV-Z]\d)$
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