实现这一点对于正则表达式而言并不是问题。
Allowing for this is not a problem with regular expressions.
您要注意的第一点是，这些正则表达式都在一行上。
The first thing you notice is that these regular expressions are all on one line.
但您并不知道表达式实际上有一点差别。
But you didn't know that the expression was actually a little off.
XPath表达式中的二进制逻辑比简单的true和false要稍微复杂一点。
Binary logic in XPath expressions is a bit more complex than simply true and false.
推导出了曲线肩点的两种新的表达式。
The two kinds of new expression of the shoulder point of the curves was presented.
推导出了曲线肩点的两种新的表达式。
The two kinds of new expression of the shoulder point of the curves was presented.
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