判断input是否以test开头。comp是比较字符的二元判断式。local是std::local。
bool ends_with (input, test);
bool ends_with (input, test, comp)
bool iends_with(input, test, local)
判断input是否以test结尾。comp是比较字符的二元判断式。local是std::local。
bool contains (input, test);
bool contains (input, test, comp)
bool icontains(input, test, local)