Email Validation in iOS - Regex not working - code contains Array of valid email addresses

Question

I have an array of supposedly valid emails, Im testing my regex statement to check if my regex method works. Based on this list, they should all return through, however some dont, how would I bullet proof my code so it works accordingly:

+(BOOL)isValidEmail: (NSString *)emailString{
    BOOL stricterFilter = YES;
    NSString *stricterFilterString = @"[A-Z0-9a-z\\._%+-]+@([A-Za-z0-9-]+\\.)+[A-Za-z]{2,4}";
    NSString *laxString = @".+@([A-Za-z0-9]+\\.)+[A-Za-z]{2}[A-Za-z]*";
    NSString *emailRegex = stricterFilter ? stricterFilterString : laxString;
    NSPredicate *emailTest = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", emailRegex];
    return [emailTest evaluateWithObject:emailString];

}

The array of valid emails is:

 NSArray *array = [NSArray arrayWithObjects:@"johndoe@gmail.com",

                  @"email@example.com",
                  @"firstname.lastname@example.com",
                  @"email@subdomain.example.com",
                  @"firstname+lastname@example.com",
                  @"email@123.123.123.123",
                  @"email@[123.123.123.123]",
                  @"“email”@example.com",
                  @"1234567890@example.com",
                  @"email@example-one.com",
                  @"_______@example.com",
                  @"email@example.name",
                  @"email@example.museum",
                  @"email@example.co.jp",
                  @"firstname-lastname@example.com",
                  nil];

I then perform this loop:

for (NSString * email in array) {
    NSLog(@"Email: %@ is valid %@",email,[NSString isValidEmail:email] ? @"YES" : @"NO");
    ;
}

Which logs:

 Email: johndoe@gmail.com is valid YES
 Email: email@example.com is valid YES
 Email: firstname.lastname@example.com is valid YES
 Email: email@subdomain.example.com is valid YES
 Email: firstname+lastname@example.com is valid YES
 Email: email@123.123.123.123 is valid NO
 Email: email@[123.123.123.123] is valid NO
 Email: /“email/”@example.com is valid NO
 Email: 1234567890@example.com is valid YES
 Email: email@example-one.com is valid YES
 Email: _______@example.com is valid YES
 Email: email@example.name is valid YES
 Email: email@example.museum is valid NO
 Email: email@example.co.jp is valid YES
 Email: firstname-lastname@example.com is valid YES

They should all be valid according to this Valid email addresses

Answer 1

Try this:

[\da-zA-Z_+\\.\-\/(“|”)]+@(([a-zA-Z\-]+(\\.[a-zA-Z]+){1,2})|(\[?[0-9]{1,3}\\.[0-9]{1,3}\\.[0-9]{1,3}\\.[0-9]{1,3}\]?))