字符表示匹配一个或多个前面的元素。
The ? character means to match zero or one instance of the previous pattern element; the * character means to match zero or more of the previous element.字符表示匹配前面模式元素的零个或一个实例,* 字符表示匹配前面元素的零个或多个实例。
One ASCII character fits within one char element.一个char元素存储一个ASCII字符。