<!--#set var="x" value="foo bar"-->
<!--#if expr="reqenv('x') =~ /^foo/ && reqenv('x') =~ /bar$/" -->
pass
<!--#else-->
fail
<!--#endif-->
<!--#if expr="env('x') =~ /^foo/ && v('x') =~ /bar$/" -->
pass
<!--#else-->
fail
<!--#endif-->
<!--#if expr="note('x') =~ /^foo/" -->
fail
<!--#else-->
pass
<!--#endif-->