带有一些html标签的NSString，如何搜索标签并获取url的内容

I have a NSString with some html tags, how can I search for tag and get the content of url? I'm not sure if I must use Hpple or a simple Regex expression. In both cases can I have some example?

我有一个带有一些html标签的NSString，我如何搜索标签并获取网址的内容？我不确定我是否必须使用Hpple或简单的Regex表达式。在这两种情况下，我可以举一些例子吗？

1 个解决方案

#1

One way to do this is using NSScanner. See this example:

一种方法是使用NSScanner。看这个例子：

NSString *url = nil;
NSString *htmlString = ...
NSScanner *theScanner = [NSScanner scannerWithString:htmlString];
// find start of IMG tag
[theScanner scanUpToString:@"<img" intoString:nil];
if (![theScanner isAtEnd]) {
    [theScanner scanUpToString:@"src" intoString:nil];
    NSCharacterSet *charset = [NSCharacterSet characterSetWithCharactersInString:@"\"'"];
    [theScanner scanUpToCharactersFromSet:charset intoString:nil];
    [theScanner scanCharactersFromSet:charset intoString:nil];
    [theScanner scanUpToCharactersFromSet:charset intoString:&url];
    // "url" now contains the URL of the img
}