提取锚标签的内容 [英] Extract Contents of Anchor Tag

问题描述

我想要做的是提取存储在NSString中的锚标签的内容。

What I'm trying to do is extract the contents of a an anchor tag being stored in an NSString.

如果例如我有一个字符串， ：

If for example I have a string with the following:

<a href="/url?q=https://kindle.amazon.com/&amp;sa=U&amp;ei=GdiWT5uCEI6BhQfihoTzDQ&amp;ved=0CCUQFjAB&amp;usg=AFQjCNEoRolsgoynLNS0H60VWz-9EaQdtw">Amazon <b>Kindle</b>: Welcome</a>

我如何提取锚标签的内容，这样我会有以下： / p>

How would I go about extracting the contents of the anchor tag so that I would have the following:

https://kindle.amazon.com/&sa=U&ei=GdiWT5uCEI6BhQfihoTzDQ&ved=0CCUQFjAB&usg=AFQjCNEoRolsgoynLNS0H60VWz-9EaQdtw

任何帮助，将不胜感激。

Any help would be greatly appreciated!

我完全厌烦，而这应该很简单？

I'm completely stumped, whereas this should be quite simple? The answer posted below keeps returning null.

推荐答案

一个可能的解决方案是使用NSScanner -

One Possible solution is by using NSScanner -

NSString *urlString = nil;
NSString *htmlString = @"<a href=\"/url?q=https://kindle.amazon.com/&amp;sa=U&amp;ei=GdiWT5uCEI6BhQfihoTzDQ&amp;ved=0CCUQFjAB&amp;usg=AFQjCNEoRolsgoynLNS0H60VWz-9EaQdtw\">Amazon <b>Kindle</b>: Welcome</a>";

NSScanner *scanner = [NSScanner scannerWithString:htmlString];

[scanner scanUpToString:@"<a" intoString:nil];
if (![scanner isAtEnd]) {
    [scanner scanUpToString:@"http" intoString:nil];
    NSCharacterSet *charset = [NSCharacterSet characterSetWithCharactersInString:@">"];
    [scanner scanUpToCharactersFromSet:charset intoString:&urlString];
}
NSLog(@"%@", urlString);

在日志中 -
https://kindle.amazon.com/&sa=U&ei=GdiWT5uCEI6BhQfihoTzDQ&ved=0CCUQFjAB& ; usg = AFQjCNEoRolsgoynLNS0H60VWz-9EaQdtw

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