I found this alternative solution.
Putting it here for myself as much as anything else.
<path id="usedByPathConvert" >
<fileset id="conditionFileSet" dir="${dir.out.css}"
includes="**/*.ccs">
<containsregexp expression="@(.*?)@"/>
</fileset>
</path>
<pathconvert refid="usedByPathConvert" property="filesFoundString" />
<fail message="Found string in the following files:
\n${filesFoundString}">
<condition>
<resourcecount refid="conditionFileSet" when="greater"
count="0" />
</condition>
</fail>
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