boost::regex: regex meta data or AST for regex?

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boost::regex: regex meta data or AST for regex?

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in concrete:
Is it possible to not only get the #no of groups (sub-expressions) via
basic_regex::mark_count(), but also their position (begin() / end()
iterators) in the given regex string (c'tor argument)?

more general:
Can an AST be created for a the given regex string (c'tor argument)?
E.g with boost::spirit?

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