Get SVN revision number of last commit in Ant build

build.xml

<exec executable="svn" spawn="false" dir="." outputproperty="revision.number">
	<arg line="info"/>
	<redirector>
		<outputfilterchain>
			<linecontainsregexp><regexp pattern="^Last\sChanged\sRev:\s[0-9]*$" /></linecontainsregexp>
			<tokenfilter>
				<replaceregex pattern="^Last\sChanged\sRev:\s([0-9]*)$" replace="\1" flags="g" />
			</tokenfilter>
		</outputfilterchain>
	</redirector>
</exec>