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std::basic_string_view::rfind

constexpr size_type rfind(basic_string_view v, size_type pos = npos) const noexcept;	(1)	(since C++17)
constexpr size_type rfind(CharT c, size_type pos = npos) const noexcept;	(2)	(since C++17)
constexpr size_type rfind(const CharT* s, size_type pos, size_type count) const;	(3)	(since C++17)
constexpr size_type rfind(const CharT* s, size_type pos = npos) const;	(4)	(since C++17)

Finds the last substring equal to the given character sequence.

1) Finds the last occurence of v in this view, starting at position pos.

2) Equivalent to rfind(basic_string_view(&c, 1), pos).

3) Equivalent to rfind(basic_string_view(s, count), pos).

4) Equivalent to rfind(basic_string_view(s), pos).

v	-	view to search for
pos	-	position at which to start the search
count	-	length of substring to search for
s	-	pointer to a character string to search for
ch	-	character to search for

Position of the first character of the found substring or npos if no such substring is found.

O(size() * v.size()) at worst.

find	find characters in the view (public member function)
find_first_of	find first occurrence of characters (public member function)
find_last_of	find last occurrence of characters (public member function)
find_first_not_of	find first absence of characters (public member function)
find_last_not_of	find last absence of characters (public member function)

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