http://blog.csdn.net/yesjava/article/details/9770293
#pragma mark - 检查是否是邮箱地址
+ (BOOL) checkEmailAddress:(NSString *)emailAddress {
NSString *strRegex = @"[A-Z0-9a-z._%+-]+@[A-Z0-9a-z._]+\\.[A-Za-z]{2,4}";
NSPredicate *emailPredicate = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", strRegex];
return [emailPredicate evaluateWithObject:emailAddress];
}
