macOS How to validate email with RegEx and Obj-C

[ace2600]

This was my first time doing regular expressions with objective-c. I did not find much out there on regex email validations for objective-c, so figured I'd post my simple example to help anyone out later.

NSString *emailRegEx = @"[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+\\.[A-Za-z]{2,4}";
NSPredicate *emailTest = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", emailRegEx];
//Valid email address
if ([emailTest evaluateWithObject:detail] == YES)
{ ... }
//Invalid email address
else
{ ... }

NSPredicate can do a lot more than just regex on a string too. Please let me know if there are better options.

 

[sujithkrishnan]

This was my first time doing regular expressions with objective-c. I did not find much out there on regex email validations for objective-c, so figured I'd post my simple example to help anyone out later.

NSString *emailRegEx = @"[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+\\.[A-Za-z]{2,4}";
NSPredicate *emailTest = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", emailRegEx];
//Valid email address
if ([emailTest evaluateWithObject:detail] == YES)
{ ... }
//Invalid email address
else
{ ... }

NSPredicate can do a lot more than just regex on a string too. Please let me know if there are better options.

What about iPhone dev?? NSPredicate wont work with iPhoneOS , right?

 

[savar]

This was my first time doing regular expressions with objective-c. I did not find much out there on regex email validations for objective-c, so figured I'd post my simple example to help anyone out later.

NSString *emailRegEx = @"[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+\\.[A-Za-z]{2,4}";
NSPredicate *emailTest = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", emailRegEx];
//Valid email address
if ([emailTest evaluateWithObject:detail] == YES)
{ ... }
//Invalid email address
else
{ ... }

NSPredicate can do a lot more than just regex on a string too. Please let me know if there are better options.

Regex and e-mail addresses don't mix.
http://www.ex-parrot.com/~pdw/Mail-RFC822-Address.html

 

[iSee]

Regex and e-mail addresses don't mix.
http://www.ex-parrot.com/~pdw/Mail-RFC822-Address.html

LOL. Nice!

To be fair, that regular expression is for validating addresses in email headers. The OPs expression is close for the dot-atom form of an addr-spec address--pretty much what people mean when they ask you to type, write, or otherwise give you their email address. IMHO, it's acceptable to validate an email address entered in to a form, for example.

Except that some valid characters are missing... looking up RFC...
Other valid characters are:

!#$&'*/=?^`{|}~

I've seen $ and ! used in real addresses before, but I don't recall ever seeing the others.

Oh yeah, the RFC you probably want to refer to is 2822: http://tools.ietf.org/html/rfc2822#section-3.4