MSBUild: Copy files with a name based on the original (following a pattern)

I have a set of files inside a folder. They all have a name which matches the pattern DR__.*. I want to copy them to another folder, but removing the DR__ prefix. How can I do this with MSBuild? I used to do it like this using NAnt:

<mkdir dir="${ClientPath + '\bin\' + ConfigurationName + '\Parameters'}"/>
<foreach item="File" property="Filename" in="CVParameters">
    <if test="${string::contains(Filename, Client + '_')}">
        <property name="newFilename" value="${ string::substring( Filename, string::last-index-of(Filename, '__') + 2, string::get-length(Filename) - string::last-index-of(Filename, '__') - 2) }"/>
        <copy file="${ Filename  }" tofile="${ ClientPath + '\bin\' + ConfigurationName + '\Parameters\' + newFilename }" overwrite="true"/>
    </if>
</foreach>