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NSRange

Hello I am trying to find out how to get characters in the middle of two characters I have heard of NSRange but I can't find documentation to it in xcode.
So here is what I am trying to do in this html page on line there are to points which stays the same and in the middle of the points is what I need here is an example.
<a href="example.com" title="Ttitle">text I want</a>
so I want to get the text in the middle of points title="Ttitle"> and </a>
Here is what I tried and did not work

NSString *url = [NSString stringWithContentsOfURL:[NSURL URLWithString:@"http://www.example.com/file.html";]];
NSString *s = url;
NSRange f, l;

f = [url rangeOfString:@"{\" title=\"Ttitle\">"];
if (f.location == NSNotFound) NSLog(@"failed");
s = [s substringFromIndex:f.location + f.length];

l = [s rangeOfString:@",\"</a>\""];
if (l.location == NSNotFound) NSLog(@"failed");
s = [s substringFromIndex:f.location + l.location];

I wanted s to equal the text in the middle but it does not.
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