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Search em NSString por tag's HTML


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Boas, neste momento tenho código que me permite obter o conteúdo que está entre uma determinada tag HTML, a questão é que no mesmo HTML há 2 tags com o mesmo nome (<description>) alguém sabe como obter apenas o valor da segunda tag?

segue o código!

// Determine "<description>" location
NSRange divRange = [html rangeOfString:@"<description>" options:NSCaseInsensitiveSearch];
if (divRange.location != NSNotFound)
 // Determine "</description>" location according to "<description>" location
 NSRange endDivRange;

 endDivRange.location = divRange.length + divRange.location;
 endDivRange.length = [html length] - endDivRange.location;
 endDivRange = [html rangeOfString:@"</description>" options:0 range:endDivRange];

 if (endDivRange.location != NSNotFound)
	 // Tags found: retrieve string between them
	 divRange.location += divRange.length;
	 divRange.length = endDivRange.location - divRange.location;

	 NSString*TEST = [html substringWithRange:divRange];


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Tens duas soluções mais elegantes que procurar ranges de uma NSString:

1. Utilizas um parser XML (ou qualquer outra opções que te permita trabalhar decentemente com o DOM).

2. Utilizas expressões regulares:

NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:@"<description>(.*?)</description>" options:0 error:&error];
NSArray *matches = [regex matchesInString:x options:0 range:NSMakeRange(0, x.length)];

NSTextCheckingResult *secondResult = matches[1];
NSRange stringRange = [secondResult rangeAtIndex:1];

NSString *result = [x substringWithRange:stringRange];

“There are two ways of constructing a software design: One way is to make it so simple that there are obviously no deficiencies, and the other way is to make it so complicated that there are no obvious deficiencies. The first method is far more difficult.”

-- Tony Hoare

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