VMS Help RTL Routines, LIB$, LIB$INDEX  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    The Index to Relative Position of Substring routine returns an
    index, which is the relative position of the first occurrence of
    a substring in the source string.

    Format

      LIB$INDEX  source-string ,sub-string

  Additional Information (explode) :

• Returns
• Arguments