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Showing content from https://cplusplus.com/reference/cstring/strpbrk/ below:

function

strpbrk

const char * strpbrk ( const char * str1, const char * str2 );      char * strpbrk (       char * str1, const char * str2 );

Locate characters in string

Returns a pointer to the first occurrence in str1 of any of the characters that are part of str2, or a null pointer if there are no matches.

The search does not include the terminating null-characters of either strings, but ends there.

Parameters

str1: C string to be scanned.
str2: C string containing the characters to match.

Return Value A pointer to the first occurrence in str1 of any of the characters that are part of str2, or a null pointer if none of the characters of str2 is found in str1 before the terminating null-character.
If none of the characters of str2 is present in str1, a null pointer is returned.

Portability In C, this function is only declared as:

char * strpbrk ( const char *, const char * );

instead of the two overloaded versions provided in C++.

Example

/* strpbrk example */
#include <stdio.h>
#include <string.h>

int main ()
{
  char str[] = "This is a sample string";
  char key[] = "aeiou";
  char * pch;
  printf ("Vowels in '%s': ",str);
  pch = strpbrk (str, key);
  while (pch != NULL)
  {
    printf ("%c " , *pch);
    pch = strpbrk (pch+1,key);
  }
  printf ("\n");
  return 0;
}

Output:

Vowels in 'This is a sample string': i i a a e i