要测试带括号表达式的递归路径，请尝试以下测试。
To test the recursive path for parenthesized expressions, try the following test.
他举出了大量的例子告诉你如何巧妙地处理那些表达式树和编译你的带自定义条件的lambda表达式。
He has a great example of how you can manipulate the expression trees and build custom conditions in your lambda expressions.
在清单1中，一旦将正则表达式编译成Pattern，它就创建了带matcher方法的matcher。
In Listing 1, once a regular expression is compiled into a Pattern, it creates a matcher with the matcher method.
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