Android Question How get domain name between @ and . of the e-mail

Hello

I need get the name domain name between '@' and '.' of the e-mail. Example:

store@domainname.com

Result: domainname

I try one regx, but not have successful.
I don't Known use the regex:

Regex.Matcher("^(?i)[a-z0-9!#$%&'*+/=?^_`{|}~-]+(?:\.[a-z0-9!#$%&'*+/=?^_`{|}~-]+)*@(?:[a-z0-9](?:[a-z0-9-]*[a-z0-9])?\.)+[a-z0-9](?:[a-z0-9-]*[a-z0-9])$", "store@domainname.com")

Click to expand...

Someone can help me, please?

Thanks very much!