Using variable substitution in replace.gsub

Question

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

You need double quotes to do variable substitution, so replace '#{year}","b' with "#{year}\",\"b". — Blender
– Blender, Commented May 1, 2013 at 23:56
String interpolation between single quotes doesn't work in Ruby. I make that mistake all the time. — hlh
– hlh, Commented May 1, 2013 at 23:58

hlh · Accepted Answer · 2013-05-02 00:07:44Z

1

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.

answered May 2, 2013 at 0:07

hlh

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