std::regex_traits<CharT>::length
static std::size_t length(const char_type* p); |
Calculates the length of a null-terminated character sequence, that is, the smallest i such that p[i]==0.
Standard library specializations of std::regex_traits execute std::char_traits<CharT>::length(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 <regex>
#include <iostream>
int main()
{
std::cout << std::regex_traits<char>::length(u8"Кошка") << '\n'
<< std::regex_traits<wchar_t>::length(L"Кошка") << '\n';
}
Output:
10 5
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https://en.cppreference.com/w/cpp/regex/regex_traits/length
