cpp/string/basic string view/find first of

Finds the first character equal to any of the characters in the given character sequence.

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

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

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