<h3>Description</h3>
<p>Replace 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>
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