C++ reference: cstring: strpbrk

strpbrk
char * strpbrk ( const char * string1, const char * string2 );

string.h

cplusplus.com

Scan string for specified characters.
Scans string1 character by character, returning a pointer to the first character that matches with any of the characters in string2.
The search does not includes the terminating null-characters.

Parameters.

string1: Null-terminated string to be scanned.
string2: Null-terminated string containing the character set to search for.

Return Value.
A pointer to the first appearance in string1 of a character specified in string2.
If none of the characters specified in string2 exists in string1, a NULL pointer is returned.

Portability.
Defined in ANSI-C.
ANSI-C++ standard specifies two different declarations for this function instead of the one included in ANSI-C:

const char * strpbrk ( const char * string1, const char * string2 );
      char * strpbrk (       char * string1, const char * string2 );

Both have the same behavior as the original declaration.

Example.

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

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

See also.
strcspn, strchr, strrchr