Library /sys$common/syshlp/helplib.hlb  —  RTL Routines, STR$  STR$FIND_FIRST_SUBSTRING
    The Find First Substring in Input String routine finds the first
    substring (in a provided list of substrings) occurring in a given
    string.

    Format

      STR$FIND_FIRST_SUBSTRING  source-string ,index ,substring-index

                                ,substring [,substring...]
Additional Information: explode extract
Returns Arguments
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