[NuAlpha]

It's not likely to be messing it up. Though the Canadian postal code validation code already formats the zipcode as upper case before returning the result to register.php.

I am fairly perplexed at why this is happening because the regex check should evaluate as '0' (false) if the postal code lacks the format: alphanum-space-alphanum

Where I am it is nearly midnight as of this post and nothing is immediately obvious, so I will have get back to you in the morning.

Anybody else care to take a stab from a fresh perspective at what could be wrong?