Boost Spirit X3 and spaces

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Boost Spirit X3 and spaces

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What is the best strategy to handle spaces with X3?
The files I want to parse have sometimes spaces or tabs for separators, but I also need to scan number that have an attached suffix (so x3::double_ >> *x3::char_).
If now I want to parse groups of strings, starting with a rule like 
const auto pin = x3::rule<class pin, std::string>()

  = x3::alpha >> *x3::char_;

what is the best to create a vector of these? *pin or pin % ' ' and will the latter also handle tabs by default?



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