Using variable substitution in replace.gsub

How do I include a variable in the 'replace' portion of gsub?

replace.gsub(/#{year}","1/, '#{year}","b')

This outputs:

=> #{year}","b

Let's say year = 2013. I want it to output:

=> 2013","b


Adding on to Blender's answer, you can use an alternate way of writing strings to avoid having to escape quotes:

replace.gsub(/#{year}","1/, %{#{year}","b})

where %{} is another way to write a string literal that you can do string interpolation in.

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