Re: validating extended profile field
I need to figure this out as well. The xprofile fields are generated (?) with a loop from an array. It looks almost impossible to do anything with a specific xprofile field if you are not an advanced PHP whiz.
Or could you just hard code the registration fields on register.php, instead of using the ‘profile field loop’? And then use field_2 and field_3 to “do stuff” with? Are there any serious downsides to that to watch out for?