or download this
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