Correct way to set a variable using regular expressions?

[Robert Schmid <rschmid@xxxxxxxxxx>]

I am upgrading from Apache 2.2 to 2.4.  In one of my pages I had the following;

<!--#if expr="$DOCUMENT_URI == /^\/([a-zA-Z0-9\-_]*)\..*$/" -->
	<!--#set var="PAGEID" value="$1" -->
<!--#endif -->

This doesn't work in 2.4 unless I enable SSILegacyExprParser which I can do but I'd like to figure out how to upgrade the pages.

I've gotten as far as;

<If "%{DOCUMENT_URI} =~ /^\/([a-zA-Z0-9\-_]*)\..*$/">
	<!--#set var="PAGEID" value="$1" -->
</If>


This is where I'm stuck.  It appears that the back reference $1 is not stored as it was before but I can't figure out how to access the back references.  Is this simply the wrong way to do this now? What is the right way?
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