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Find the last occurrence of a string within the string.
constexpr size_type rfind( const_pointer s, size_type pos = npos) const;
            Finds the last occurrence of the string pointed to by s
            of length count within
            the string starting before or at the index pos,
            where count is traits_type::length(s).
          
Linear.
            The highest index idx
            less than or equal to pos
            where each element of {s, s + count)
            is equal to that of {begin()
            + idx, begin()
            + idx + count) if one exists, and npos otherwise.
          
| Name | Description | 
|---|---|
| 
                       | The string to search for. | 
| 
                       | 
                      The index to stop searching at. The default argument for this
                      parameter is  |