cpp/string/basic string view/find

Finds the first substring equal to the given character sequence.

@1@Finds the first occurence of in this view, starting at position. @2@Equivalent to. @3@Equivalent to. @4@Equivalent to.

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

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