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deduction guides for std::basic_regex

From cppreference.com
 
 
 
Regular expressions library
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(C++11)
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(C++11)
Regex Grammar
 
 
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
}