The name of this game is called "Templates" and Perl is very good at it.
in reply to How to make dynamic result in META varriable in perl template toolkit
Check out modules such as Template Toolkit, Mojo::Template, Mason or HTML::Template.
There are many many more templating engines, the above are just a few randomly selected (although I personally like Template Toolkit very much).
A program should be light and agile, its subroutines connected like a string of pearls. The spirit and intent of the program should be retained throughout. There should be neither too little or too much, neither needless loops nor useless variables, neither lack of structure nor overwhelming rigidity." - The Tao of Programming, 4.1 - Geoffrey James
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