[Serusers] subst() usage - weird behavior?

[Kanakatti Mahesh Subramanya]

One of my clients has a weird Cisco router which is chopping off the end 
of the Contact headers that are being sent to me.
They look like Contact: 
<sip:foo at 192.168.28.102:5060;transport=udp;line=8hzddhav>;q=
Thats right, "q="
So, I figured that as a temporary hack (till they got the Cisco 
patched), i'd check incoming packets, and replace the "q=" with a "q=1.0"
i.e., doing the following

if ( subst( '/^Contact:(.*);q=$/Contact:\1q=1.0/' ) {
...
}

however, as far as I can tell, the above substitution never actually 
takes place?
What gives? 
Do I need to match for '\r' too?

Ideas?
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