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deduction guides for std::basic_regex

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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

Run this code 
#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
}