I need to find '<id' and replace it with <cache usage="read-write"/>

and my current code is below. So, if any one can help me how to modify my code for replacement, then it would be great

    <target name="change-id" depends="gen-hbm">
        <regexp id="id.regexp" pattern='<id' />

        <replaceregexp replace='somethingssomething\n^?id'>
            <regexp refid="id.regexp" />
            <fileset dir="${dest.dir}">
                <include name="**/*.hbm.xml" />
                
            </fileset>
        </replaceregexp>
    </target>