std::regex_traits<CharT>::length

Calculates the length of a null-terminated character sequence, that is, the smallest i such that p[i] == 0.

# Declarations

static std::size_t length( const char_type* p );

# Parameters

• p: pointer to the first element of the null-terminated character sequence

# Return value

The length of the null-terminated character string.

# Example

#include <iostream>
#include <regex>
 
int main()
{
    std::cout << std::regex_traits<char>::length("Кошка") << '\n'
              << std::regex_traits<wchar_t>::length(L"Кошка") << '\n';
}