<li><img alt="" src="../images/down.gif" /> <a href="#canonicalurl">Canonical URLs</a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#moveddocroot">Moved <code>DocumentRoot</code></a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#fallback-resource">Fallback Resource</a></li>
+<li><img alt="" src="../images/down.gif" /> <a href="#rewrite-query">Rewrite query string</a></li>
</ul><h3>See also</h3><ul class="seealso"><li><a href="../mod/mod_rewrite.html">Module documentation</a></li><li><a href="intro.html">mod_rewrite introduction</a></li><li><a href="access.html">Controlling access</a></li><li><a href="vhosts.html">Virtual hosts</a></li><li><a href="proxy.html">Proxying</a></li><li><a href="rewritemap.html">Using RewriteMap</a></li><li><a href="advanced.html">Advanced techniques</a></li><li><a href="avoid.html">When not to use mod_rewrite</a></li></ul><ul class="seealso"><li><a href="#comments_section">Comments</a></li></ul></div>
<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
<div class="section">
</dl>
+</div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
+<div class="section">
+<h2><a name="rewrite-query" id="rewrite-query">Rewrite query string</a></h2>
+
+
+<dl>
+<dt>Description:</dt>
+<dd>You want to capture a particular value from a query string
+and either replace it or incorporate it into another component
+of the URL.</dd>
+
+<dt>Solutions:</dt>
+<dd>
+<p> Many of the solutions in this section will all use the same condition,
+which leaves the matched value in the %2 backreference. %1 is the beginining
+of the query string (up to the key of intererest), and %3 is the remainder. This
+condition is a bit complex for flexibility and to avoid double '&&' in the
+substitutions.</p>
+<ul>
+ <li>This solution removes the matching key and value:
+
+<pre class="prettyprint lang-config"># Remove mykey=???
+RewriteCond %{QUERY_STRING} (.*(?:^|&))mykey=([^&]*)&?(.*)&?$
+RewriteRule (.*) $1?%1%3</pre>
+
+ </li>
+
+ <li>This solution uses the captured value in the URL subsitution,
+ discarding the rest of the original query by appending a '?':
+
+<pre class="prettyprint lang-config"># Copy from query string to PATH_INFO
+RewriteCond %{QUERY_STRING} (.*(?:^|&))mykey=([^&]*)&?(.*)&?$
+RewriteRule (.*) $1/products/%2/? [PT]</pre>
+
+ </li>
+
+ <li>This solution checks the captured value in a subsequent condition:
+
+<pre class="prettyprint lang-config"># Capture the value of mykey in the query string
+RewriteCond %{QUERY_STRING} (.*(?:^|&))mykey=([^&]*)&?(.*)&?$
+RewriteCond %2 !=not-so-secret-value
+RewriteRule (.*) - [F]</pre>
+
+ </li>
+
+ <li>This solution shows the reverse of the previous ones, copying
+ path components (perhaps PATH_INFO) from the URL into the query string.
+<pre class="prettyprint lang-config"># The desired URL might be /products/kitchen-sink, and the script expects
+# /path?products=kitchen-sink.
+RewriteRule ^/?path/([^/]+)/([^/]+) /path?$1=$2 [PT]</pre>
+
+ </li>
+</ul>
+
+</dd>
+
+</dl>
</div></div>
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