Test for lexicographical inequality.
template<class charT, class traits, class Allocator> bool operator!= (const basic_string<charT,traits,Allocator>& lhs, const basic_string<charT,traits,Allocator>& rhs); template<class charT, class traits, class Allocator> bool operator!= (const charT* lhs,const basic_string <charT,traits,Allocator>& rhs); template<class charT, class traits, class Allocator> bool operator!= (const basic_string<charT,traits,Allocator>& lhs, const charT* rhs);
True if the strings do not match otherwise false.