Named Subexpressions 命名子表达式
Eliminate Common Subexpressions 删除公共子表达式
Back-references and Subexpressions 后向引用和子表达式
This optimization removes invariant subexpressions from the body of a loop.
此优化将不变量子表达式从循环体中移除。
No. The individual subexpressions are not sequenced with respect to one another.
第个人的子表达式不相对于另一个序列。
And the subexpressions can be combined using the and, or, and not logical operators.
而子表达式又可使用and、or和not逻辑运算符组合起来。
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