使用NSDataDetector检查电子邮件

Question

我有一个来自服务器的字符串,想检查它是否包含电话号码,邮件地址和电子邮件等表达式.我在电话号码和邮件地址方面取得了成功,但没有收到电子邮件.我是NSDataDetector为了这个目的而使用的.例如

NSString *string = sourceNode.label; //coming from server

//Phone number
NSDataDetector *phoneDetector = [NSDataDetector dataDetectorWithTypes:NSTextCheckingTypePhoneNumber error:nil]; 
NSArray *phoneMatches = [phoneDetector matchesInString:string options:0 range:NSMakeRange(0, [string length])];

for (NSTextCheckingResult *match in phoneMatches) {

    if ([match resultType] == NSTextCheckingTypePhoneNumber) {
        NSString *matchingStringPhone = [match description];
        NSLog(@"found URL: %@", matchingStringPhone);
    }
}  

但是如何为电子邮件做同样的事情呢？

Answer 1

if(result.resultType == NSTextCheckingTypeLink)
{
    if([result.URL.absoluteString rangeOfString:@"mailto:"].location != NSNotFound)
    {
        // email link
    }
    else
    {
        // url
    }
}

电子邮件地址属于NSTextCheckingTypeLink.只需在找到的URL中查找"mailto:",您就会知道它是一封电子邮件或URL.

Answer 2

尝试以下代码,看看它是否适合您:

NSString * mail = so@so.com
NSDataDetector * dataDetector = [NSDataDetector dataDetectorWithTypes:NSTextCheckingTypeLink error:nil];
NSTextCheckingResult * firstMatch = [dataDetector firstMatchInString:mail options:0 range:NSMakeRange(0, [mail length])];
BOOL result = [firstMatch.URL isKindOfClass:[NSURL class]] && [firstMatch.URL.scheme isEqualToString:@"mailto"];

Answer 3

在苹果文档中，似乎识别的类型不包括电子邮件：http : //developer.apple.com/library/IOs/#documentation/AppKit/Reference/NSTextCheckingResult_Class/Reference/Reference.html#//apple_ref/c/tdef /NSTextCheckingType

所以我建议你使用正则表达式。它会像：

NSString* pattern = @"[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+\\.[A-Za-z]+";

NSPredicate* predicate = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", pattern];
if ([predicate evaluateWithObject:@"johndoe@example.com"] == YES) {
  // Okay
} else {
  // Not found
}

编辑 ：

因为@dunforget 得到了最好的解决方案，尽管我是公认的，请阅读他的回答。

Answer 4

这是一个干净的 Swift 版本。

extension String {
    func isValidEmail() -> Bool {
        guard !self.lowercaseString.hasPrefix("mailto:") else { return false }
        guard let emailDetector = try? NSDataDetector(types: NSTextCheckingType.Link.rawValue) else { return false }
        let matches = emailDetector.matchesInString(self, options: NSMatchingOptions.Anchored, range: NSRange(location: 0, length: self.characters.count))
        guard matches.count == 1 else { return false }
        return matches[0].URL?.absoluteString == "mailto:\(self)"
    }
}

斯威夫特 3.0 版本：

extension String {
    func isValidEmail() -> Bool {
        guard !self.lowercased().hasPrefix("mailto:") else { return false }
        guard let emailDetector = try? NSDataDetector(types: NSTextCheckingResult.CheckingType.link.rawValue) else { return false }
        let matches = emailDetector.matches(in: self, options: NSRegularExpression.MatchingOptions.anchored, range: NSRange(location: 0, length: self.characters.count))
        guard matches.count == 1 else { return false }
        return matches[0].url?.absoluteString == "mailto:\(self)"
    }
}

Objective-C：

@implementation NSString (EmailValidator)

- (BOOL)isValidEmail {
    if ([self.lowercaseString hasPrefix:@"mailto:"]) { return NO; }

    NSDataDetector* dataDetector = [NSDataDetector dataDetectorWithTypes:NSTextCheckingTypeLink error:nil];
    if (dataDetector == nil) { return NO; }

    NSArray* matches = [dataDetector matchesInString:self options:NSMatchingAnchored range:NSMakeRange(0, [self length])];
    if (matches.count != 1) { return NO; }

    NSTextCheckingResult* match = [matches firstObject];
    return match.resultType == NSTextCheckingTypeLink && [match.URL.absoluteString isEqualToString:[NSString stringWithFormat:@"mailto:%@", self]];
}

@end