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copied!<p>Consider using <a href="http://developer.apple.com/documentation/Cocoa/Reference/Foundation/Classes/NSScanner_Class/" rel="nofollow noreferrer">NSScanner</a>, and specifically the methods <a href="http://developer.apple.com/documentation/Cocoa/Reference/Foundation/Classes/NSScanner_Class/Reference/Reference.html#//apple_ref/occ/instm/NSScanner/setCharactersToBeSkipped:" rel="nofollow noreferrer"><code>-setCharactersToBeSkipped:</code></a> (which accepts an NSCharacterSet) and <a href="http://developer.apple.com/documentation/Cocoa/Reference/Foundation/Classes/NSScanner_Class/Reference/Reference.html#//apple_ref/occ/instm/NSScanner/scanString:intoString:" rel="nofollow noreferrer"><code>-scanString:intoString:</code></a> (which accepts a string and returns the scanned string by reference).</p> <p>You may also want to couple this with <a href="http://developer.apple.com/documentation/Cocoa/Reference/Foundation/Classes/NSString_Class/Reference/NSString.html#//apple_ref/occ/instm/NSString/localizedCompare:" rel="nofollow noreferrer"><code>-[NSString localizedCompare:]</code></a>, or perhaps <a href="http://developer.apple.com/documentation/Cocoa/Reference/Foundation/Classes/NSString_Class/Reference/NSString.html#//apple_ref/occ/instm/NSString/compare:options:" rel="nofollow noreferrer"><code>-[NSString compare:options:]</code></a> with the <a href="http://developer.apple.com/documentation/Cocoa/Reference/Foundation/Classes/NSString_Class/Reference/NSString.html#//apple_ref/doc/c_ref/NSDiacriticInsensitiveSearch" rel="nofollow noreferrer">NSDiacriticInsensitiveSearch</a> option. That could simplify having to remove/replace accents, so you can focus on removing puncuation, whitespace, etc.</p> <p>If you must use an approach like you presented in your question, at least use an NSMutableString and <code>replaceOccurrencesOfString:withString:options:range:</code> — that will be much more efficient than creating tons of nearly-identical autoreleased strings. It could be that just reducing the number of allocations will boost performance "enough" for the time being.</p>

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