I'm currently using
if(preg_match('~@(semo\.edu|uni\.uu\.se|)$~', $email))
as a domain check.
However I need to only check if the e-mail ends with the domains above. So for instance, all these need to be accepted:
[email protected]
[email protected]
[email protected]
So I'm guessing I need something after the @ but before the ( which is something like "any random string or empty string". Any regexp-ninjas out there who can help me?
([^@]*\.)? works if you already know you're dealing with a valid email address. Explanation: it's either empty, or anything that ends with a period but does not contain an ampersand. So student.cs.semo.edu matches, as does plain semo.edu, but not [email protected]. So:
~@([^@]*\.)?(semo\.edu|uni\.uu\.se)$~
Note that I've removed the last | from your original regex.
You can use [a-zA-Z0-9\.]* to match none or more characters (letters, numbers or dot):
~@[a-zA-Z0-9\.]*(semo\.edu|uni\.uu\.se|)$~
Well .* will match anything. But you don't actually want that. There are a number of characters that are invalid in a domain name (ex. a space). Instead you want something more like this:
[\w.]*
I might not have all of the allowed characters, but that will get you [A-Za-z0-9_.]. The idea is that you make a list of all the allowed characters in the square brakets and then use * to say none or more of them.
