如何在swift中验证电子邮件地址？ [英] How to validate an e-mail address in swift?

问题描述

有谁知道如何验证Swift的电子邮件地址？我发现这个代码：

   - （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选项：NSRegularExpressionCaseInsensitive错误：nil]; 
 NSUInteger regExMatches = [regEx numberOfMatchesInString：emailString options：0 range：NSMakeRange（0，[emailString length]）]; 
 
 NSLog（@％i，regExMatches）; 
 if（regExMatches == 0）{
 return NO; 
} else {
 return YES; 
} 
} 
  

但是我无法将其翻译成Swift。 / p>

解决方案

我将使用 NSPredicate ：

  func isValidEmail（testStr：String） - > Bool {
 // print（validate calendar：\（testStr））
 let emailRegEx =[A-Z0-9a-z ._％+  - ] + @ [A-Za- z0-9 .-] + \\。[A-Za-z] {2，}
 
让emailTest = NSPredicate（格式：SELF MATCHES％@，emailRegEx）
 return emailTest.evaluate（with：testStr）
} 
  

的Swift早于3.0：

  func isValidEmail（testStr：String） - > Bool {
 // print（validate calendar：\（testStr））
 let emailRegEx =[A-Z0-9a-z ._％+  - ] + @ [A-Za- z0-9 .-] + \\。[A-Za-z] {2，}
 
让emailTest = NSPredicate（格式：SELF MATCHES％@，emailRegEx）
 return emailTest.evaluateWithObject（testStr）
} 
  

早于1.2：

 类func isValidEmail（testStr：String） - > Bool {
 println（validate calendar：\（testStr））
 let emailRegEx =[A-Z0-9a-z ._％+  - ] + @ [A-Za-z0-如果允许emailTest = NSPredicate（格式为SELF MATCHES％@，emailRegEx）{
 
 $ b [A-Za-z] {2，} $ b return emailTest.evaluateWithObject（testStr）
} 
 return false 
} 
  

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.

解决方案

I would use NSPredicate:

 func isValidEmail(testStr:String) -> Bool {
    // print("validate calendar: \(testStr)")
    let emailRegEx = "[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+\\.[A-Za-z]{2,}"

    let emailTest = NSPredicate(format:"SELF MATCHES %@", emailRegEx)
    return emailTest.evaluate(with: testStr)
}

for versions of Swift earlier than 3.0:

 func isValidEmail(testStr:String) -> Bool {
    // print("validate calendar: \(testStr)")
    let emailRegEx = "[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+\\.[A-Za-z]{2,}"

    let emailTest = NSPredicate(format:"SELF MATCHES %@", emailRegEx)
    return emailTest.evaluateWithObject(testStr)
}

for versions of Swift earlier than 1.2:

 class func isValidEmail(testStr:String) -> Bool {
    println("validate calendar: \(testStr)")
    let emailRegEx = "[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+\\.[A-Za-z]{2,}"

    if let emailTest = NSPredicate(format:"SELF MATCHES %@", emailRegEx) {
        return emailTest.evaluateWithObject(testStr)
    }
    return false
}

这篇关于如何在swift中验证电子邮件地址？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！