HELPLIB.HLB  —  RTL Routines, STR$  STR$POSITION
    The Return Relative Position of Substring routine searches for
    the first occurrence of a single substring within a source
    string. If STR$POSITION finds the substring, it returns the
    relative position of that substring. If the substring is not
    found, STR$POSITION returns a zero.

    Format

      STR$POSITION  source-string ,substring [,start-position]
Additional Information: explode extract
Corresponding JSB Entry Point Returns Arguments
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