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

    The Match Characters and Return Relative Position routine
    searches a source string for a specified substring and returns
    an index, which is the relative position of the first occurrence
    of a substring in the source string. The relative character
    positions returned by LIB$MATCHC are numbered 1, 2, . . . , n.
    Thus, zero means that the substring was not found.

    Format

      LIB$MATCHC  sub-string ,source-string

  Additional Information (explode) :

• Returns
• Arguments