This is a base class for other code expression objects that is never instantiated.
这是其他从不实例化的代码表达式对象的基类。
Regular Expression objects store patterns used to search strings for character combinations.
正则表达式对象存储用于搜索字符组合的字符串的模式。
If the expression represents a class or structure, retrieve a list of member variables, as expression objects.
如果表达式表示类或结构，则将作为表达式对象来检索成员变量列表。
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