C++ Primer Plus

The find_first_not_of() Family

The find_first_not_of() methods have these prototypes:

size_type find_first_not_of(const basic_string& str,                           size_type pos = 0) const noexcept;size_type find_first_not_of(const charT* s, size_type pos,                            size_type n) const;size_type find_first_not_of(const charT* s, size_type pos = 0) const;size_type find_first_not_of(charT c, size_type pos = 0) const noexcept;

These methods work like the corresponding find_first_of() methods, except that they search for the first occurrence of any character not in the substring.

Here’s code for finding the location of the first two occurrences of any of the letters not in "This" in a longer string:

string longer("That is a funny ...