Email Validation in Objective-C

isValidEmail.m

+ (BOOL)isValidEmail:(NSString *)str
{
   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:str];
}