Method find_first_of

src/common/classes/fb_string.h:291–294

		size_type rfind(const_pointer s, const size_type pos = npos) const;
		size_type rfind(char_type c, const size_type pos = npos) const;
		size_type find_first_of(const AbstractString& str, size_type pos = 0) const
		{
			return find_first_of(str.c_str(), pos, str.length());
		}
		size_type find_first_of(const_pointer s, size_type pos, size_type n) const;
		size_type find_first_of(const_pointer s, size_type pos = 0) const
		{