可能重複：
Ensure User has entered email address string in correct format?驗證在iphone中的UITextField的電子郵件地址
我有UITextField在我從用戶自己輸入電子郵件地址，我想驗證該電子郵件地址，例如我應該檢查它是否包含@符號和其他電子郵件字符等符號。
如果電子郵件地址中有錯誤，則應顯示UIAlertView，它會顯示「輸入有效的電子郵件地址」。
目標C風格
NSString *emailRegEx = @"[A-Z0-9a-z._%+-][email protected][A-Za-z0-9.-]+\\.[A-Za-z]{2,10}";
NSPredicate *emailTest = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", emailRegEx];
if ([emailTest evaluateWithObject:email.text] == NO) {
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Test!" message:@"Please Enter Valid Email Address." delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil];
[alert show];
[alert release];
return;
}
Swift Style
class func isValidEmail(emailString:String) -> Bool {
let emailRegEx = "[A-Z0-9a-z._%+-][email protected][A-Za-z0-9.-]+\\.[A-Za-z]{2,10}"
var emailTest = NSPredicate(format:"SELF MATCHES %@", emailRegEx)
let result = emailTest?.evaluateWithObject(emailString)
return result!
}
可以使用NSPredicate
做到這一點//suppose emailID is your entered email address NSString
NSString *emailFormat1 = @"[A-Z0-9a-z._][email protected][A-Za-z0-9]+\\.[A-Za-z]{2,4}";
NSPredicate *emailTest1 = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", emailFormat1];
if ([emailTest1 evaluateWithObject:emailID]||[emailTest2 evaluateWithObject:emailID]) {
//yes it is valid
}
else
//no it is invalid