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<title>Replace Task</title>
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<h2 id="replace">Replace</h2>
<h3>Description</h3>
<p><code>Replace</code> is a directory based task for replacing the occurrence of a given string
with another string in selected file.</p>
<p>If you want to replace a text that crosses line boundaries, you must use a
nested <code>&lt;replacetoken&gt;</code> element.</p>

<p>The output file is only written if it differs from the existing file.  This prevents spurious
rebuilds based on unchanged files which have been regenerated by this task.</p>

<h3>Parameters</h3>
<table class="attr">
  <tr>
    <th scope="col">Attribute</th>
    <th scope="col">Description</th>
    <th scope="col">Required</th>
  </tr>
  <tr>
    <td>file</td>
    <td>file for which the token should be replaced.</td>
    <td rowspan="2">Exactly one of the two</td>
  </tr>
  <tr>
    <td>dir</td>
    <td class="left">The base directory to use when replacing a token in multiple files.</td>
  </tr>
  <tr>
    <td>encoding</td>
    <td>The encoding of the files upon which replace operates.</td>
    <td>No; defaults to default JVM character encoding</td>
  </tr>
  <tr>
    <td>token</td>
    <td>the token which must be replaced.</td>
    <td>Yes, unless a nested <code>replacetoken</code> element or the <var>replacefilterfile</var>
      attribute is used.</td>
  </tr>
  <tr>
    <td>value</td>
    <td>the new value for the token.</td>
    <td>No; defaults to empty string (<q></q>)</td>
  </tr>
  <tr>
    <td>summary</td>
    <td>Indicates whether a summary of the replace operation should be produced, detailing how many
      token occurrences and files were processed</td>
    <td>No; defaults to no summary</td>
  </tr>
  <tr>
    <td>propertyFile</td>
    <td>valid property file from which properties specified using
      nested <code>&lt;replacefilter&gt;</code> elements are drawn.</td>
    <td>Yes, only if <var>property</var> attribute of <code>&lt;replacefilter&gt;</code> is
      used.</td>
  </tr>
  <tr>
    <td>replacefilterfile</td>
    <td>valid property file.  Each property will be treated as a <code>replacefilter</code>
      where <var>token</var> is the name of the property and <var>value</var> is the property's
      value.</td>
    <td>No</td>
  </tr>
  <tr>
    <td>includes</td>
    <td>comma- or space-separated list of patterns of files that must be included.</td>
    <td>No; defaults to all (<q>**</q>)</td>
  </tr>
  <tr>
    <td>includesfile</td>
    <td>name of a file. Each line of this file is taken to be an include pattern</td>
    <td>No</td>
  </tr>
  <tr>
    <td>excludes</td>
    <td>comma- or space-separated list of patterns of files that must be excluded.</td>
    <td>No; defaults to default excludes or none if <var>defaultexcludes</var> is <q>no</q></td>
  </tr>
  <tr>
    <td>excludesfile</td>
    <td>name of a file. Each line of this file is taken to be an exclude pattern</td>
    <td>No</td>
  </tr>
  <tr>
    <td>defaultexcludes</td>
    <td>indicates whether default excludes should be used or not (<q>yes|no</q>).</td>
    <td>No; defaults to <q>yes</q></td>
  </tr>
  <tr>
    <td>preserveLastModified</td>
    <td>Keep the file timestamp(s) even if the file(s) is(are) modified.  <em>since Apache Ant
      1.8.0</em>.</td>
    <td>No; defaults to <q>false</q></td>
  </tr>
  <tr>
    <td>failOnNoReplacements</td>
    <td>Whether to fail the build if the task didn't do anything.  <em>since Ant 1.8.0</em>.</td>
    <td>No; defaults to <q>false</q></td>
  </tr>
</table>
<h3>Examples</h3>
<pre>&lt;replace file=&quot;${src}/index.html&quot; token=&quot;@@@&quot; value=&quot;wombat&quot;/&gt;</pre>
<p>replaces occurrences of the string <q>@@@</q> with the string <q>wombat</q>, in the
file <samp>${src}/index.html</samp>.</p>
<h3>Parameters specified as nested elements</h3>
<p>This task forms an implicit <a href="../Types/fileset.html">FileSet</a> and supports most
attributes of <code>&lt;fileset&gt;</code> as well as the
nested <code>&lt;include&gt;</code>, <code>&lt;exclude&gt;</code>
and <code>&lt;patternset&gt;</code> elements.</p>
<p><em>Since Ant 1.8.0</em>, this task supports any filesystem
based <a href="../Types/resources.html#collection">resource collections</a> as nested elements.</p>
<h4>replacetoken and replacevalue</h4>
<p>If either the text you want to replace or the replacement text cross line boundaries, you can use
nested elements to specify them.</p>
<p>The elements support attributes:</p>
<table class="attr">
  <tr>
    <th scope="col">Attribute</th>
    <th scope="col">Description</th>
    <th scope="col">Required</th>
  </tr>
  <tr>
    <td>expandProperties</td>
    <td>Whether to expand properties in the nested text.  <em>Since Ant 1.8.0</em>.</td>
    <td>No; defaults to <q>true</q></td>
  </tr>
</table>
<h3>Examples</h3>
<pre>
&lt;replace dir=&quot;${src}&quot; value=&quot;wombat&quot;&gt;
  &lt;include name=&quot;**/*.html&quot;/&gt;
  &lt;replacetoken&gt;&lt;![CDATA[multi line
token]]&gt;&lt;/replacetoken&gt;
&lt;/replace&gt;</pre>
<p>replaces occurrences of the string <q>multi line<i>\n</i>token</q> with the string <q>wombat</q>,
in all HTML files in the directory <samp>${src}</samp>. Here, <q><i>\n</i></q> is the platform
specific line separator.</p>
<pre>
&lt;replace file=&quot;${src}/index.html&quot;&gt;
  &lt;replacetoken&gt;&lt;![CDATA[two line
token]]&gt;&lt;/replacetoken&gt;
  &lt;replacevalue&gt;&lt;![CDATA[two line
token]]&gt;&lt;/replacevalue&gt;
&lt;/replace&gt;</pre>
<h4>replacefilter</h4>
<p>In addition to allowing for multiple replacements, optional
nested <code>&lt;replacefilter&gt;</code> elements allow replacement values to be extracted from a
property file. The name of this file is specified using the <code>&lt;replace&gt;</code>
attribute <var>propertyFile</var>.</p>
<table class="attr">
  <tr>
    <th scope="col">Attribute</th>
    <th scope="col">Description</th>
    <th scope="col">Required</th>
  </tr>
  <tr>
    <td>token</td>
    <td>The string to search for.</td>
    <td>Yes, unless a nested <code>replacetoken</code>
      is specified</td>
  </tr>
  <tr>
    <td>value</td>
    <td>The replacement string.</td>
    <td rowspan="2">Either may be specified, but not both. Both can be omitted, if desired.</td>
  </tr>
  <tr>
    <td>property</td>
    <td class="left">Name of the property whose value is to serve as the replacement value.</td>
  </tr>
</table>
<p><em>Since Ant 1.8.0</em>, <var>token</var> and <var>value</var> can be specified as nested
elements just like in the task itself.</p>
<p>If neither <var>value</var> nor <var>property</var> is used, the value provided using
the <code>&lt;replace&gt;</code> attribute <var>value</var> and/or
the <code>&lt;replacevalue&gt;</code> element is used. If no value was specified using either of
these options, the token is replaced with an empty string.</p>
<h3>Examples</h3>
<p>In file <samp>configure.sh</samp>, replace all instances of <q>@token1@</q>
with <q>defaultvalue</q>, all instances of <q>@token2@</q> with <q>value2</q>, and all instances
of <q>@token3@</q> with the value of the property <code>property.key</code>, as it appears in
property file <samp>src/name.properties</samp>.</p>
<pre>
&lt;replace file=&quot;configure.sh&quot;
         value=&quot;defaultvalue&quot;
         propertyFile=&quot;src/name.properties&quot;&gt;
  &lt;replacefilter token=&quot;@token1@&quot;/&gt;
  &lt;replacefilter token=&quot;@token2@&quot;
                 value=&quot;value2&quot;/&gt;
  &lt;replacefilter token=&quot;@token3@&quot;
                 property=&quot;property.key&quot;/&gt;
  &lt;replacefilter&gt;
    &lt;replacetoken&gt;@token4@&lt;/replacetoken&gt;
    &lt;replacevalue&gt;value4&lt;/replacevalue&gt;
  &lt;/replacefilter&gt;
&lt;/replace&gt;</pre>
<p><strong>Note</strong>: It is possible to use either
the <var>token</var>/<code>&lt;replacetoken&gt;</code>
and <var>value</var>/<code>&lt;replacevalue&gt;</code> attributes/elements, the
nested <code>replacefilter</code> elements, or both in the same operation.</p>

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