cpp/string/basic string view/find first not of

Finds the first character not equal to any of the characters in the given character sequence.

@1@ Finds the first character not equal to 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 character not equal to any of the characters in the given string, or std if no such character is found.

Complexity
O(sizesize) at worst.