extracting string.Template substitution placeholders

[Eric S. Johansson]

As part of speech recognition accessibility tools that I'm building, I'm 
using string.Template. In order to construct on-the-fly grammar, I need 
to know all of the identifiers before the template is filled in. what is 
the best way to do this?
can string.Template handle recursive expansion i.e. an identifier 
contains a template.
Thanks
--- eric
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