How to validate an e-mail address in swift?

Question

Does anyone know how to validate an e-mail address in Swift? I found this code:

- (BOOL) validEmail:(NSString*) emailString {      if([emailString length]==0){         return NO;     }      NSString *regExPattern = @"[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+\\.[A-Za-z]{2,4}";      NSRegularExpression *regEx = [[NSRegularExpression alloc] initWithPattern:regExPattern options:NSRegularExpressionCaseInsensitive error:nil];     NSUInteger regExMatches = [regEx numberOfMatchesInString:emailString options:0 range:NSMakeRange(0, [emailString length])];      NSLog(@"%i", regExMatches);     if (regExMatches == 0) {         return NO;     } else {         return YES;     } } 

but I can't translate it to Swift.

Answer 1

I would use NSPredicate:

func isValidEmail(_ email: String) -> Bool {             let emailRegEx = "[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+\\.[A-Za-z]{2,64}"      let emailPred = NSPredicate(format:"SELF MATCHES %@", emailRegEx)     return emailPred.evaluate(with: email) } 

for versions of Swift earlier than 3.0:

func isValidEmail(email: String) -> Bool {     let emailRegEx = "[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+\\.[A-Za-z]{2,64}"      let emailPred = NSPredicate(format:"SELF MATCHES %@", emailRegEx)     return emailPred.evaluate(with: email) } 

for versions of Swift earlier than 1.2:

func isValidEmail(email: String) -> Bool {     let emailRegEx = "[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+\\.[A-Za-z]{2,64}"      if let emailPred = NSPredicate(format:"SELF MATCHES %@", emailRegEx) {         return emailPred.evaluateWithObject(email)     }     return false } 

Answer 2

As a String class extension

SWIFT 4

extension String {     func isValidEmail() -> Bool {         // here, `try!` will always succeed because the pattern is valid         let regex = try! NSRegularExpression(pattern: "^[a-zA-Z0-9.!#$%&'*+/=?^_`{|}~-]+@[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?(?:\\.[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?)*$", options: .caseInsensitive)         return regex.firstMatch(in: self, options: [], range: NSRange(location: 0, length: count)) != nil     } } 

Usage

if "rdfsdsfsdfsd".isValidEmail() {  }