F$LOCATE

   Locates a specified portion of a character string and returns as
   an integer the offset of the first character. (An offset is the
   position of a character or a substring relative to the beginning
   of the string. The first character in a string is always offset
   position 0 from the beginning of the string.)

   If the substring is not found, F$LOCATE returns the length (the
   offset of the last character in the character string plus one) of
   the searched string.

   Format

     F$LOCATE(substring,string)

Additional information available:

Return_Value    Arguments       Examples