strpbrk() - locate multiple characters in string
#include <string.h>
char * strpbrk (const char *s, const char *charset)
The strpbrk(3) function locates in the NUL-terminated string s the first occurrence of any character in the string charset and returns a pointer to this character. If no characters from charset occur anywhere in s, strpbrk(3) returns NULL.
On success, strpbrk(3) returns a pointer to a character. On failure, it returns NULL.
memchr(3)
strchr(3)
strcspn(3)
strrchr(3)
strsep(3)
strspn(3)
strstr(3)
strtok(3)