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25<div id="preamble"><h1>Apache Module mod_substitute</h1>
26<div class="toplang">
27<p><span>Available Languages: </span><a href="/en/mod/mod_substitute.html" title="English">&nbsp;en&nbsp;</a></p>
28</div>
29<table class="module"><tr><th><a href="module-dict.html#Description">Description:</a></th><td>Perform search and replace operations on response bodies</td></tr>
30<tr><th><a href="module-dict.html#Status">Status:</a></th><td>Extension</td></tr>
31<tr><th><a href="module-dict.html#ModuleIdentifier">Module�Identifier:</a></th><td>substitute_module</td></tr>
32<tr><th><a href="module-dict.html#SourceFile">Source�File:</a></th><td>mod_substitute.c</td></tr>
33<tr><th><a href="module-dict.html#Compatibility">Compatibility:</a></th><td>Available in Apache 2.2.7 and later</td></tr></table>
34<h3>Summary</h3>
35
36    <p><code class="module"><a href="/mod/mod_substitute.html">mod_substitute</a></code> provides a mechanism to perform
37    both regular expression and fixed string substitutions on
38    response bodies.</p>
39</div>
40<div id="quickview"><h3 class="directives">Directives</h3>
41<ul id="toc">
42<li><img alt="" src="/images/down.gif" /> <a href="#substitute">Substitute</a></li>
43</ul>
44<ul class="seealso"><li><a href="#comments_section">Comments</a></li></ul></div>
45
46<div class="top"><a href="#page-header"><img alt="top" src="/images/up.gif" /></a></div>
47<div class="directive-section"><h2><a name="Substitute" id="Substitute">Substitute</a> <a name="substitute" id="substitute">Directive</a></h2>
48<table class="directive">
49<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Pattern to filter the response content</td></tr>
50<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>Substitute <var>s/pattern/substitution/[infq]</var></code></td></tr>
51<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>directory, .htaccess</td></tr>
52<tr><th><a href="directive-dict.html#Override">Override:</a></th><td>FileInfo</td></tr>
53<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
54<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_substitute</td></tr>
55</table>
56    <p>The <code class="directive">Substitute</code> directive specifies a
57    search and replace pattern to apply to the response body.</p>
58    
59    <p>The meaning of the pattern can be modified by using any
60    combination of these flags:</p>
61    
62    <dl>
63        <dt><code>i</code></dt>
64        <dd>Perform a case-insensitive match.</dd>
65        <dt><code>n</code></dt>
66        <dd>By default the pattern is treated as a regular expression.
67        Using the <code>n</code> flag forces the pattern to be treated
68        as a fixed string.</dd>
69        <dt><code>f</code></dt>
70        <dd>The <code>f</code> flag causes mod_substitute to flatten the
71        result of a substitution allowing for later substitutions to
72        take place on the boundary of this one. This is the default.</dd>
73        <dt><code>q</code></dt>
74        <dd>The <code>q</code> flag causes mod_substitute to not
75        flatten the buckets after each substitution. This can
76        result in much faster response and a decrease in memory
77        utilization, but should only be used if there is no possibility
78        that the result of one substitution will ever match a pattern
79        or regex of a subsequent one.</dd>
80    </dl>
81    
82    <div class="example"><h3>Example</h3><p><code>
83        &lt;Location /&gt;
84        <span class="indent">
85            AddOutputFilterByType SUBSTITUTE text/html<br />
86            Substitute s/foo/bar/ni<br />
87        </span>
88        &lt;/Location&gt;
89    </code></p></div>
90    
91    <p>If either the pattern or the substitution contain a slash
92    character then an alternative delimiter should be used:</p>
93    
94    <div class="example"><h3>Example of using an alternate delimiter</h3><p><code>
95        &lt;Location /&gt;
96        <span class="indent">
97            AddOutputFilterByType SUBSTITUTE text/html<br />
98            Substitute "s|&lt;BR */?&gt;|&lt;br /&gt;|i"
99        </span>
100        &lt;/Location&gt;
101    </code></p></div>
102
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