On 16.12.20 18:05, Frank Bergemann via Boost-users wrote:

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? I am busy with #2 parsers:

1) RegexParser: Intended to be a full regular expression parser https://github.com/F-Bergemann/RegexParser 2) RegexSplitter: to just break up regular expression into substrings for top level regex-group & non-regex-group substrings: https://github.com/F-Bergemann/RegexSplitter It's just a start and so much wrong within, i know. But i have one concrete question for the RegexSplitter: How can i avoid in RegexSplitter.cpp to use #157 ( tok_element >> *tok_element ) [ qi::_val = phx::new_<ASTNode> (qi::_1, qi::_2, ASTNode::COLLECTION_c) ]; I want to pass a SINGLE std::vector<ATSNode *> only to the receiving #51 // COLLECTION_c #52 ASTNode::ASTNode( #53 ASTNode const * first, #54 std::vector<ASTNode *> & others, #55 Type const type) without the SEPARATE parameter 'first'. I.e. i need to "merge" qi::_1 and qi::_2.