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    Topic complex String functions
    Function pos()
    Short Acquires the first incidence of a substring in a string
    Syntax POS(Teilstr, Str : STRING) : INTEGER
    Parameter substr, Str : any strings
    Return 0, if substr is not included in Str
    else position of the first according character.
    See also:
    HAS strcomp()
    Description Examples:

    POS('ei','Meier') -> 2
    POS('Huber','Meier') -> 0
    POS('Meier','Meier') -> 1

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