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rindex (string_to_search, pattern)

     Usage: Locates the last occurrence of pattern in string_to_search.
            The first character in the string is in position 1.
            If pattern is the null string, the result is undefined. See
            search_string to search a string using regular expressions.

Parameters: String_to_search and pattern .strings..

   Returns: The position of pattern in string_to_search, or 0 if
            it was not found.