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my $re_start = qr/../; #match string begining with two of anything (0 
+or more times each!)
                       # but still a potential problem: would match a 
+null string)
...
                    # (preceding the comma in your initial set of rege
+xen) 
                  # with anything other than two instances of somethin
+g
                 #  or another

c:\@Work\Perl\monks>perl -wMstrict -le
"my $rx_dotdot = qr{ .. }xms;
...
   if '' =~ m{ $rx_counted? }xms;
"
C: match empty string: counted, quantified