java string and wildcards

How can I check that a string is a valid email address?  Would I use some kind of wildcard to check?

for example lets say we have an email address:  someone@yahoo.com

and i want to make sure the string has some text, then an @ symbol, then some text, then a period, then some text.
The idea of wild card that I was thinking would be something like this:

String email = "someone@yahoo.com";
if(email.compareToIgnoreCase("'%@%.%'") == 0) {
    System.out.println("Email is valid");
}

I haven't tested this just because I don't know if java supports wildcards.

Any suggestions would be greatly appreciated