[tlug] perl regexp question

[Ryan Shaw <ryan.shaw@example.com>]

is it possible to write a regexp that will do 
something like the following:

file10.txt -> file11.txt
file20.txt -> file21.txt
file55.txt -> file56.txt

etc.

something along the lines of s/(\d+)/$1+1/
though obviously that doesn't work.

is it not possible to manipulate the values
in the capture buffers like this?

ryan

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