strpbrk - search a string for any of a set of bytes
The strpbrk() function locates the first occurrence in the string
s of any of the bytes in the string
The strpbrk() function returns a pointer to the byte in
s that matches one of the bytes in
accept, or NULL if no such byte is found.
POSIX.1-2001, POSIX.1-2008, C89, C99, SVr4, 4.3BSD.
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