parsing make like syntax

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Hi,

I need to parse make variable reference like syntax:

$($(foo))

$(foo) should be detected first, replaced (let's say with bar) and result=
ant string $(bar) should be parsed the same way.
There can be any number of nested references like

$(abc$(foo)def)

Any suggestions how to define rules for this?

I used Regexp::Common to detect balanced parenthesis.


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