how to gsub on the last occurence ?

[Laurent Faillie <l_faillie@...>]

Hi all,

how can I substitue that last occurence of a string ?

I would like to do
     string.gsub("blabla/in0_input", "_input", "_alarm")

but I need to ensure the "_input" is really at the end of the string
(blabla may contains anything :) ).

Thanks

Laurent