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    <blockquote> <p>This all works fine, I'm worried about the efficiency of the cleaning section...</p> </blockquote> <p>Really? Did you inspect the resulting "string"? On my machine the data in <code>forumContentCleaned</code> still contains the <code>&amp;amp;sid=...</code> data.</p> <p>That's because </p> <pre><code>forumContentList.removeAll(Arrays.asList(sidPattern)); </code></pre> <p>tries to remove a <code>List&lt;byte[]&gt;</code> from a <code>List&lt;Byte&gt;</code>. This will do nothing. And even if you replace the argument of <code>removeAll</code> with a real <code>List&lt;Byte&gt;</code> containing the bytes of <code>"&amp;amp;sid="</code>, then you will remove <strong>ALL</strong> occurences of each <code>a</code>, each <code>m</code>, each <code>p</code> and so forth. The resulting data will look like this: </p> <pre><code>&lt;l cl"con-logout"&gt;&lt; href"./uc.h?oelogout34043284674572e35881e022c68fc8" ttle.... </code></pre> <p>Well, strictly speaking, the <code>&amp;amp;sid=</code> part is gone, but I'm quite sure this is not what you wanted.</p> <p>Therefore take a step back and think: You are doing string manipulation here, so use a <code>StringBuilder</code>, feed it with the <code>String(forumContent)</code> and do your manipulation there. </p> <p><strong>Edit</strong></p> <p>Looking at the given example input string, I guess, that also the <em>value</em> of <code>sid</code> should be removed, not only the key. This code should do it efficiently without regular expresions:</p> <pre><code>String removeSecrets(String input){ StringBuilder sb = new StringBuilder(input); String sidStart = "&amp;amp;sid="; String sidEnd = "\""; int posStart = 0; while ((posStart = sb.indexOf(sidStart, posStart)) &gt;= 0) { int posEnd = sb.indexOf(sidEnd, posStart); if (posEnd &lt; 0) // delete as far as possible - YMMV posEnd = sb.length(); sb.delete(posStart, posEnd); } return sb.toString(); } </code></pre> <p><strong>Edit 2</strong></p> <p>Here is a small benchmark between <code>StringBuilder</code> and <code>String.replaceAll</code>:</p> <pre><code>public class ReplaceAllBenchmark { public static void main(String[] args) throws Throwable { final int N = 1000000; String input = "&lt;li class=\"icon-logout\"&gt;&lt;a href=\"./ucp.php?mode=logout&amp;amp;sid=3a4043284674572e35881e022c68fcd8\" title=\"Logout [ barry ]\" accesskey=\"x\"&gt;Logout [ barry ]&lt;/a&gt;&amp;amp;sid=3a4043284674572e35881e022c68fcd8\"&lt;/li&gt;"; stringBuilderBench(input, N); regularExpressionBench(input, N); } static void stringBuilderBench(String input, final int N) throws Throwable{ for(int run=0; run&lt;5; ++run){ long t1 = System.nanoTime(); for(int i=0; i&lt;N; ++i) removeSecrets(input); long t2 = System.nanoTime(); System.out.println("sb: "+(t2-t1)+"ns, "+(t2-t1)/N+"ns/call"); Thread.sleep(1000); } } static void regularExpressionBench(String input, final int N) throws Throwable{ for(int run=0; run&lt;5; ++run){ long t1 = System.nanoTime(); for(int i=0; i&lt;N; ++i) removeSecrets2(input); long t2 = System.nanoTime(); System.out.println("regexp: "+(t2-t1)+"ns, "+(t2-t1)/N+"ns/call"); Thread.sleep(1000); } } static String removeSecrets2(String input){ return input.replaceAll("&amp;amp;sid=[^\"]*\"", "\""); } } </code></pre> <p>Results: </p> <pre><code>java version "1.6.0_20" OpenJDK Runtime Environment (IcedTea6 1.9.9) (6b20-1.9.9-0ubuntu1~10.04.2) OpenJDK 64-Bit Server VM (build 19.0-b09, mixed mode) sb: 538735438ns, 538ns/call sb: 457107726ns, 457ns/call sb: 443282145ns, 443ns/call sb: 453978805ns, 453ns/call sb: 458895308ns, 458ns/call regexp: 2404818405ns, 2404ns/call regexp: 2196834572ns, 2196ns/call regexp: 2239056178ns, 2239ns/call regexp: 2164337638ns, 2164ns/call regexp: 2177091893ns, 2177ns/call </code></pre>
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    1. COI'm just working on it now... Apologies for posting dodgy code :-( +1
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    2. COAs an aside, the test did pass when I posted the question, but afterwards I had realised I'd made a mistake at the forumContentList.addAll(forumContent); line. I'd actually pasted forumContentList.addAll(forumContentList); which is nonsense but I got the JUnit green line :-/ No excuse, I know...
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    3. COI've looked at StringBuilder, but I thing String looks more suited to my needs, as the replaceAll() method does exactly what I need.
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