Two very popular and common templating modules are Template Toolkit and HTML::Template -- i would start by looking at both of those.. Template Toolkit (tt) is quite powerful, and has a (default) syntax like:

This is my file.
  Hello, [% first_name %].  You have [% rows.size %] items:
  [% FOREACH row = rows %]
    Name: [% row.name %]  ; Color = [% row.color %]  [% 'Wow!!!' IF ro
+w.color == 'red' %]
  [% END %]
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