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copied!<p>I think the best way to find the match is by using regulars expressions with <strong>NSRegularExpression</strong>.</p> <pre><code>NSString * stringEx=@"www.mysite.com/word-4-word-1-1-word-word-2-word-817061.html"; NSError *error = NULL; NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:@"-(\\d*).html$" options:NSRegularExpressionCaseInsensitive error:&error]; NSArray *matches = [regex matchesInString:stringEx options:NSMatchingReportCompletion range:NSMakeRange(0, [stringEx length])]; if ([matches count] > 0) { NSString* resultString = [stringEx substringWithRange:[matches[0] rangeAtIndex:1]]; NSLog(@"Matched: %@", resultString); } </code></pre> <p>Make sure you use an extra <code>\</code> escape character in the regex <code>NSString</code> whenever needed.</p> <p><strong>UPDATE</strong></p> <p>I did a test using the two different approaches (regex vs string splitting) with the code below:</p> <pre><code>NSDate *timeBefore = [NSDate date]; NSError *error = NULL; NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:@"-(\\d*).html$" options:NSRegularExpressionCaseInsensitive error:&error]; for (int i = 0; i < 100000; i++) { NSArray *matches = [regex matchesInString:stringEx options:NSMatchingReportCompletion range:NSMakeRange(0, [stringEx length])]; if ([matches count] > 0) { NSString* resultString = [stringEx substringWithRange:[matches[0] rangeAtIndex:1]]; } } NSTimeInterval timeSpent = [timeBefore timeIntervalSinceNow]; NSLog(@"Time: %.5f", timeSpent*-1); </code></pre> <p>on the simulator the differences are not significant, but running on an iPhone 4 I got the following results:</p> <pre><code>2013-11-25 10:24:19.795 NotifApp[406:60b] Time: 11.45771 // string splitting 2013-11-25 10:25:10.451 NotifApp[412:60b] Time: 7.55713 // regex </code></pre> <p>so I guess the best approach depends on case to case.</p>

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