Boost C++ Libraries

Find the last occurrence of a string within the string.

std::size_t
rfind(
    string_view sv,
    std::size_t pos = npos) const;

Returns the highest index idx less than or equal to pos where each element of sv is equal to that of {begin() + idx, begin() + idx + sv.size()) if one exists, and npos otherwise.

Linear.

The last occurrence of sv within the string starting before or at the index pos, or npos if none exists.