/sys$common/syshlp/helplib.hlb CC, Run-time functions, strpbrk  *Conan The Librarian (sorry for the slow response - running on an old VAX)

  Searches a string for the occurrence of one of a specified set of
  characters.

  Syntax:

       #include <string.h>

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