从string中检索图片url
我正在parsing一个XML文件，我可以NSLogparsing，但我的问题是，我需要从这个“string”获取图像的URL：
<p> <a href="http://www.bubblesurprise.com/WPRESS_APP/wp-content/uploads/2012/02/ex43.jpg"><img class="alignnone size-thumbnail wp-image-81" title="ex4" src="http://www.bubblesurprise.com/WPRESS_APP/wp-content/uploads/2012/02/ex43-150x150.jpg" alt="" width="150" height="150" /></a> <a href="http://www.bubblesurprise.com/WPRESS_APP/wp-content/uploads/2012/02/ex32.jpg"><img class="alignnone size-thumbnail wp-image-80" title="ex3" src="http://www.bubblesurprise.com/WPRESS_APP/wp-content/uploads/2012/02/ex32-150x150.jpg" alt="" width="150" height="150" /></a> <a href="http://www.bubblesurprise.com/WPRESS_APP/wp-content/uploads/2012/02/ex23.jpg"><img class="alignnone size-thumbnail wp-image-79" title="ex2" src="http://www.bubblesurprise.com/WPRESS_APP/wp-content/uploads/2012/02/ex23-150x150.jpg" alt="" width="150" height="150" /></a> <a href="http://www.bubblesurprise.com/WPRESS_APP/wp-content/uploads/2012/02/ex12.jpg"><img class="alignnone size-thumbnail wp-image-71" title="ex1" src="http://www.bubblesurprise.com/WPRESS_APP/wp-content/uploads/2012/02/ex12-150x150.jpg" alt="" width="150" height="150" /></a> </p> 对不起，明码:)
什么即时通讯使用提取url是这个代码，但它不工作：
NSRange start = [item.imageGallery rangeOfString:@"http://www.bubblesurprise.com/WPRESS_APP/wp-content/uploads/"]; NSRange end = [item.imageGallery rangeOfString:@"\" "]; int rangeLength = (int)(end.location - start.location); NSString *hrefString = [[NSString alloc] initWithString:[item.imageGallery substringWithRange:NSMakeRange(start.location, rangeLength)]]; NSLog(@"image url = %@",hrefString);
使用正则expression式： "src=\"([^\"]+)\""
以下是一些示例代码：
NSString *searchedString = @"" @"<p>" @"<a href=\"http://www.bubblesurprise.com/WPRESS_APP/wp-content/uploads/2012/02/ex43.jpg\"><img class=\"alignnone size-thumbnail wp-image-81\" title=\"ex4\" src=\"http://www.bubblesurprise.com/WPRESS_APP/wp-content/uploads/2012/02/ex43-150x150.jpg\" alt=\"\" width=\"150\" height=\"150\" /></a>" @"<a href=\"http://www.bubblesurprise.com/WPRESS_APP/wp-content/uploads/2012/02/ex32.jpg\"><img class=\"alignnone size-thumbnail wp-image-80\" title=\"ex3\" src=\"http://www.bubblesurprise.com/WPRESS_APP/wp-content/uploads/2012/02/ex32-150x150.jpg\" alt=\"\" width=\"150\" height=\"150\" /></a>" @"<a href=\"http://www.bubblesurprise.com/WPRESS_APP/wp-content/uploads/2012/02/ex23.jpg\"><img class=\"alignnone size-thumbnail wp-image-79\" title=\"ex2\" src=\"http://www.bubblesurprise.com/WPRESS_APP/wp-content/uploads/2012/02/ex23-150x150.jpg\" alt=\"\" width=\"150\" height=\"150\" /></a>" @"<a href=\"http://www.bubblesurprise.com/WPRESS_APP/wp-content/uploads/2012/02/ex12.jpg\"><img class=\"alignnone size-thumbnail wp-image-71\" title=\"ex1\" src=\"http://www.bubblesurprise.com/WPRESS_APP/wp-content/uploads/2012/02/ex12-150x150.jpg\" alt=\"\" width=\"150\" height=\"150\" /></a>" @"</p>"; NSRange rangeOfString = NSMakeRange(0, [searchedString length]); //NSLog(@"searchedString: %@", searchedString); NSString *pattern = @"src=\"([^\"]+)\""; NSError* error = nil; NSRegularExpression* regex = [NSRegularExpression regularExpressionWithPattern:pattern options:0 error:&error]; NSArray *matchs = [regex matchesInString:searchedString options:0 range:rangeOfString]; for (NSTextCheckingResult* match in matchs) { NSLog(@"url: %@", [searchedString substringWithRange:[match rangeAtIndex:1]]); }
NSLog输出：
url: http://www.bubblesurprise.com/WPRESS_APP/wp-content/uploads/2012/02/ex43-150x150.jpg url: http://www.bubblesurprise.com/WPRESS_APP/wp-content/uploads/2012/02/ex32-150x150.jpg url: http://www.bubblesurprise.com/WPRESS_APP/wp-content/uploads/2012/02/ex23-150x150.jpg url: http://www.bubblesurprise.com/WPRESS_APP/wp-content/uploads/2012/02/ex12-150x150.jpg
在这里，我find了你：
https://stackoverflow.com/a/5999294/1047258
该答案的代码：
NSDataDetector* detector = [NSDataDetector dataDetectorWithTypes:NSTextCheckingTypeLink error:nil]; NSArray* matches = [detector matchesInString:source options:0 range:NSMakeRange(0, [source length])];
然后处理这个URL：
for (NSTextCheckingResult *match in matches) { NSURL *url = [match URL]; // do whatever you want with the url }