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    <p>NSRegularExpression way:</p> <pre><code>NSString *text = @"Lorem Ipsum is simply dummy text of the printing and typesetting industry"; NSError *error = NULL; NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:@"\\b\\w{1,4}\\b\\s?" options:NSRegularExpressionCaseInsensitive error:&amp;error]; NSString *modifiedString = [regex stringByReplacingMatchesInString:text options:0 range:NSMakeRange(0, [text length]) withTemplate:@""]; NSLog(@"Result: %@", modifiedString); </code></pre> <p>Result:</p> <pre><code>Lorem Ipsum simply dummy printing typesetting industry </code></pre> <p><br/> </p> <h1><strong>UPDATE</strong></h1> <p>Performance test <strong>NSPredicate</strong> vs <strong>NSRegularExpression</strong></p> <pre><code>NSString *string = @"Lorem Ipsum is simply dummy text of the printing and typesetting industry"; // NSPredicate NSDate *start1 = [NSDate date]; for (int i = 1; i &lt;= 10000; i++) { NSArray *words = [string componentsSeparatedByString:@" "]; NSPredicate *pred = [NSPredicate predicateWithFormat:@"length &gt; 4"]; NSArray *largerWords = [words filteredArrayUsingPredicate:pred]; NSString *filteredString = [largerWords componentsJoinedByString:@" "]; } NSDate *finsh1 = [NSDate date]; NSTimeInterval executionTime1 = [finsh1 timeIntervalSinceDate:start1]; NSLog(@"Execution Time NSPredicate: %f", executionTime1); // NSRegularExpression NSDate *start2 = [NSDate date]; for (int i = 1; i &lt;= 10000; i++) { NSError *error = NULL; NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:@"\\b\\w{1,4}\\b\\s?" options:NSRegularExpressionCaseInsensitive error:&amp;error]; NSString *modifiedString = [regex stringByReplacingMatchesInString:string options:0 range:NSMakeRange(0, [string length]) withTemplate:@""]; } NSDate *finsh2 = [NSDate date]; NSTimeInterval executionTime2= [finsh2 timeIntervalSinceDate:start2]; NSLog(@"Execution Time NSRegularExpression: %f", executionTime2); </code></pre> <p><strong>Result:</strong></p> <pre><code>Execution Time NSPredicate: 0.246003 Execution Time NSRegularExpression: 0.594555 </code></pre> <p><strong>NSPredicate solution is much faster than NSRegularExpression</strong></p> <p>Thanks @Alladinian for NSPredicate solution</p>
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