What's wrong with the following regular expression? As far as I can se, only alphabetic characters including the special swedish ones, should be let through, but whatever character passed on in $_REQUEST['f_name'] passes the test?

if(!ereg("(^[a-zA-Z]{4,20})", $_REQUEST['f_name'])) {
error("Your first name should be between 4 and 20 alphabetic characters");

The next one, used to check valid birthday dates, work. And I can't see where they differ!

if(!ereg("([0-9]{4})-([0-9]{2})-([0-9]{2})", $_REQUEST['birthday']))



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