rules: starts with alphanumeric 3 chars long
Note, so we are not confused: you mean _at least_ 3 chars long. (Not _only_ 3 chars long.)
require ONLY one period require alpha after the period
Ok, what exactly do you mean here? Is this: a. Require _only_ alpha after the period? b. Require _the next char_ to be alpha?
Either one is possible from your description, and could be a big difference.
/^[a-zA-Z0-9][\w-].[a-zA-z]/ #but now working
sub validate { local $_ = shift; return( length >= 3 and tr/.// == 1 and /^[[:alpha:]]/ and /[a-zA-Z0-9].[a-zA-Z]/ ); #added here still not working }
That last line says: Match one character (alpha or numeric only) then any character, then a single alpha character.
If you want the _next_ character to be alpha, the following should work:
/\.[[:alpha:]]/
If you want _only_ (and at least one) alpha after the period, you need this:
/\.[[:alpha:]]+$/
Hope this helps.
Daniel T. Staal
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