find_first_not

Finds the first position that is not one of the elements in the function's argument starting from the beginning.

  size_type find_first_not_of

  (const basic_string& str,size_type pos = 0) const;

  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;

Remarks

The found position or npos if not found.