Ruby gsub multiple characters in string

Question

Using Ruby 1.9.3, Rails 3.2, I have the following:

\"every good boy does fine\".gsub(\"every\", \"all\").gsub(\"boy\", \"girl\").gsub(\"fine\", \"well\")
# =         


        

Answer 1

If the intent is to avoid method chaining:

[9] pry(main)> "every good boy does fine".gsub("every", "all").gsub("boy", "girl").gsub("fine", "well")
=> "all good girl does well"
[10] pry(main)> "every good boy does fine".gsub(/(every)|(boy)|(fine)/) do |word|
[10] pry(main)*   case word
[10] pry(main)*   when "every"
[10] pry(main)*     "all"
[10] pry(main)*   when "boy"
[10] pry(main)*     "girl"
[10] pry(main)*   when "fine"
[10] pry(main)*     "well"
[10] pry(main)*   end
[10] pry(main)* end
=> "all good girl does well"

Alternatively:

[11] pry(main)> REPLACEMENT = { "every" => "all", "boy" => "girl", "fine" => "well"}
=> {"every"=>"all", "boy"=>"girl", "fine"=>"well"}
[12] pry(main)> "every good boy does fine".gsub(/(every)|(boy)|(fine)/) { |word| REPLACEMENT[word] }
=> "all good girl does well"