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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)
                      # so, perhaps, qr/.{1).(1)/ which will not allow
+ a string 
                    # (preceding the comma in your initial set of rege
+xen) 
                  # with anything other than two instances of somethin
+g
                 #  or another