fix email validation regex
fix email validation regex

basic email format is:
	<username>@<host>.<tld>

so the regex to match that, with the assumption that username, host and tld
consist of any character except white space types and '@' would be:
	[^\s@]+@[^\s@]+\.[^\s@]+

jdm64/GenesisChess-Android,jdm64/GenesisChess-Android