Library /sys$common/syshlp/helplib.hlb  —  RTL Routines, STR$  STR$POS_EXTR
    The Extract a Substring of a String routine copies a substring of
    a source string into a destination string.

    Format

      STR$POS_EXTR  destination-string ,source-string ,start-position

                    ,end-position
Additional Information: explode extract
Corresponding JSB Entry Point Returns Arguments
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