Substitute partial line in vim using only substitute command -


I am editing a file with the same lines as: 

  { "a_function", A_function}, {"a_second_function", a_second_function},   
 I would like to change the underscore to blank space, but only within quotation marks. Is this a way to do this using the : substitute  command? I know I can do this by recording a macro and maybe there are plugins that can do this, but for cleverness I want to do it with a : substitute  command in a shot.   
 
 
 You should do this command:  
 :% s / v (". {-}") / \ = option (constraint (1), "_", "", "g")   
 I add quotation marks to the first pair on each line I remove all as a replacement with underscores.

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