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POImprove algorithm for finding URLs in a body of text - obj-c
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  1. POImprove algorithm for finding URLs in a body of text - obj-c
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    copied!<p>I'm trying to come up with an algorithm to find URLs in a body of text. I currently have the following code (this was my sit down and hack it out code, and I know there has to be a better way):</p> <pre><code> statusText.text = @"http://google.com http://www.apple.com www.joshholat.com"; NSMutableArray *urlLocations = [[NSMutableArray alloc] init]; NSRange currentLocation = NSMakeRange(0, statusText.text.length); for (int x = 0; x &lt; statusText.text.length; x++) { currentLocation = [[statusText.text substringFromIndex:(x + currentLocation.location)] rangeOfString:@"http://"]; if (currentLocation.location &gt; statusText.text.length) break; [urlLocations addObject:[NSNumber numberWithInt:(currentLocation.location + x)]]; } currentLocation = NSMakeRange(0, statusText.text.length); for (int x = 0; x &lt; statusText.text.length; x++) { currentLocation = [[statusText.text substringFromIndex:(x + currentLocation.location)] rangeOfString:@"http://www."]; if (currentLocation.location &gt; statusText.text.length) break; [urlLocations addObject:[NSNumber numberWithInt:(currentLocation.location + x)]]; } currentLocation = NSMakeRange(0, statusText.text.length); for (int x = 0; x &lt; statusText.text.length; x++) { currentLocation = [[statusText.text substringFromIndex:(x + currentLocation.location)] rangeOfString:@" www." options:NSLiteralSearch]; if (currentLocation.location &gt; statusText.text.length) break; [urlLocations addObject:[NSNumber numberWithInt:(currentLocation.location + 1 + x)]]; } //Get rid of any duplicate locations NSSet *uniqueElements = [NSSet setWithArray:urlLocations]; [urlLocations release]; NSArray *finalURLLocations = [[NSArray alloc] init]; finalURLLocations = [uniqueElements allObjects]; //Parse out the URLs of each of the locations for (int x = 0; x &lt; [finalURLLocations count]; x++) { NSRange temp = [[statusText.text substringFromIndex:[[finalURLLocations objectAtIndex:x] intValue]] rangeOfString:@" "]; int length = temp.location + [[finalURLLocations objectAtIndex:x] intValue]; if (temp.location &gt; statusText.text.length) length = statusText.text.length; length = length - [[finalURLLocations objectAtIndex:x] intValue]; NSLog(@"URL: %@", [statusText.text substringWithRange:NSMakeRange([[finalURLLocations objectAtIndex:x] intValue], length)]); } </code></pre> <p>I feel like it could be improved via the usage of regular expressions or something. Any help in improving this would be greatly appreciated.</p>
 

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