In trying to get something done a co-worker came up with this little regex:
perl -e
'$a="abcde"x200;$a=~s{((\w+?)(??{!$b{$^N}++?"(?=)":"(?!)"}))}{($1)}xg;print
"$a\n";'
Basically, it creates a simple hash lookup of all the unique
occurrences of the string.
It's probably not practical for a whole lot, but it's still kind of cool.
--
Alan
