Question

I’m playing around with Ruby to do some file versioning for me. I have a string 2.0.0.65 . I split it up, increment the build number (65 –> 66) then I want to replace the 65 with the 66. In this replace though, I only want to replace the last match of the string. What’s the best way in Ruby to do this?

 version_text = IO.read('C:\\Properties')
 puts version_text
 version = version_text.match(/(\d+\.\d+\.\d+\.\d+)/)[1]
 puts version
 build_version = version.split('.')[3]
 puts build_version
 incremented_version =  build_version.to_i + 1
 puts incremented_version`
 ...

Answer 1

If you just want to increment the integer at the very end of a string then try this:

s = '2.0.0.65'
s.sub(/\d+\Z/) {|x| x.to_i + 1} # => '2.0.0.66'