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<p>Before</p>
<!--#set var="d" value="$1" -->
<!--#if expr="$QUERY_STRING = /a=(.*)/" -->
<!--#set var="a" value="$1" -->
<!--#endif -->
<!--#if expr="$QUERY_STRING = /b=(.*)/" -->
<!--#set var="b" value="$1" -->
<!--#endif -->
<!--#set var="c" value="$1" -->
<p>a<!--#echo var="a" -->b<!--#echo var="b" -->c<!--#echo var="c" -->d<!--#echo var="d" --></p>
<p>After</p>