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Showing content from https://en.cppreference.com/w/cpp/language/../algorithm/../string/byte/strcspn.html below:

std::strcspn - cppreference.com

std::size_t strcspn( const char *dest, const char *src );

Returns the length of the maximum initial segment of the byte string pointed to by dest, that consists of only the characters not found in byte string pointed to by src.

The function name stands for "complementary span".

[edit] Parameters dest - pointer to the null-terminated byte string to be analyzed src - pointer to the null-terminated byte string that contains the characters to search for [edit] Return value

The length of the maximum initial segment that contains only characters not found in the byte string pointed to by src.

[edit] Example

#include <cstddef>
#include <cstring>
#include <iomanip>
#include <iostream>
#include <string>
 
int main()
{
    std::string s = "abcde312$#@";
    const char* invalid = "*$#";
 
    const std::size_t valid_len = std::strcspn(s.c_str(), invalid);
    if (valid_len != s.size())
    {
        std::cout << std::quoted(s)
                  << " contains invalid chars starting at position "
                  << valid_len << '\n'
                  << std::string(valid_len + 1, '-') << "^\n";
    }
}

Output:

"abcde312$#@" contains invalid chars starting at position 8
---------^

[edit] See also returns the length of the maximum initial segment that consists
of only the characters found in another byte string
(function) [edit] returns the length of the maximum initial segment that consists
of only the wide not found in another wide string
(function) [edit] finds the first location of any character from a set of separators
(function) [edit] find first occurrence of characters
(public member function of std::basic_string<CharT,Traits,Allocator>) [edit]

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