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deduction guides for std::basic_regex

Defined in header <regex> 
template<class ForwardIt> 
basic_regex(ForwardIt, ForwardIt,
            std::regex_constants::syntax_option_type = std::regex_constants::ECMAScript)
-> basic_regex<typename std::iterator_traits<ForwardIt>::value_type>;
 (since C++17)

This deduction guide is provided for std::basic_regex to allow deduction from an iterator range.

Example

#include <regex>
#include <vector>
int main() {
   std::vector<char> v = {'a', 'b', 'c'};
   std::basic_regex re{v.begin(), v.end()}; // uses explicit deduction guide
}

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