// 利用正则表达式验证 -( BOOL )isValidateEmail:( NSString *)email
{
NSString *emailRegex = @"[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+\\.[A-Za-z]{2,4}" ;
NSPredicate *emailTest = [ NSPredicate predicateWithFormat : @"SELF MATCHES%@" ,emailRegex];
return [emailTest evaluateWithObject :email];
}
原文：http://www.cnblogs.com/yunis/p/4290767.html