How can I easily bulk rename files with Perl?

Question

I have a lot of files I\'m trying to rename, I tried to make a regular expression to match them, but even that I got stuck on the files are named like:

<

Answer 1

you could do something using perl or ruby.

put all this files in the same directory

dirlisting = DIR.entries('.')

dirListing.each do |file| 
 num = file.match(/\d+$/).to_i
 if num < 100
   find the position where start the number, with index and inject the 0 there.
 end
end