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POMod Rewrite Regex - Multiple Negative Lookaheads
 

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    <p>I currently have the working Mod Rewrite Regex:</p> <pre><code>RewriteEngine On RewriteCond %{QUERY_STRING} ^(.*)$ RewriteRule ^(.*/)?((?:cmd)[^/]*)/((?!(?:cmd)[.+]*)(.+)) $1?$2=$3&amp;%1 [L] </code></pre> <p>That regex takes the following URL and transforms it into the URL immediately below:</p> <p><code>www.site.com/cmd1/param/cmd2/param2/stillparam2</code> and turn it into <code>www.site.com/index.php?cmd1=param&amp;cmd2=param2/stillparam2</code></p> <p>That works fine, but I would also like to create another negative lookahead assertion to ensure that a URL block - ie a <code>/texthere/</code> param - doesn't include an underscore. An invalid string might look like: <code>www.test.com/cmd/thing/getparam_valuehere</code>; the regex should parse the <code>cmd/thing</code> as a key and value pair and ignore the rest of the string. I would then also write another RewriteRule to have the block of the URL with the underscore in it added as another URL parameter. The following URL translation would occur:</p> <pre><code>www.test.com/cmd/param1/cmd2/directory/param2/sortorder_5 www.test.com?cmd=param1&amp;cmd2=directory/param2&amp;sortorder=5 </code></pre> <p>Please let me know if I have not been clear enough. Any help would be great.</p> <p>NB: I have tried using a negative lookahead nested inside the one already present - <code>(?!(?!))</code> - and have tried using an <code>|</code> on two negative lookaheads, but neither solutions worked. I thought that perhaps something else was more fundamentally wrong?</p> <p>Thanks all.</p> <p><strong>Edit:</strong> I have also tried the following - which I really thought would work (but obviously, didn't!)</p> <pre><code>RewriteRule ^(.*/)?((?:cmd)[^/]*)/((?!(?:cmd)[.+]*)(?![.+]*(?:_)[.+]*)(.+)) $1?$2=$3&amp;%1 [L] </code></pre> <p>That does the following:</p> <p><code>www.test.com/cmd/param1/sortorder_1/</code> translates to <code>www.test.com?cmd=param1/sortorder_1/</code></p> <p>When it should instead become: <code>www.test.com?cmd=param1&amp;sortorder=2/</code>. The rule to translate <code>/sortorder_2/</code> into<code>&amp;sortorder=2</code> has not yet been created, but you can hopefully see what I mean).</p>
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    1. CO_Lookbehinds_ must be of constant length, variable-length lookaheads should be OK.
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    2. COYes, definitely only negative lookaheads are being used here. Thanks for the replied!
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    3. COI have also tried the following: `RewriteRule ^(.*/)?((?:cmd)[^/]*)/((?!(?:[A-Za-z0-9])*_+(?:[A-Za-z0-9])*)(.+)) $1?$2=$3&%1 [L]`. Here, I have removed the original (working) negative lookahead and replaced it with another one that should ensure an underscore is not present in a URL block before including it as part of a parameter. This did not work, and generated the following query string: `cmd=key/to/command/value_here/sortorder_5/` It was my intention for it to stop at `/value_here/` so that I could validate the negative lookahead finds the underscore segment correctly. No luck.
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