When approaching a regular expression, treat it as its own programming problem, even though only one or two lines of code may be involved; those lines effectively form a small program.

当处理规则表达式时，将它作为它自己的编程问题来处理，即使只涉及一或两行代码；这些行有效地构成了一个小程序。

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If you've spent a significant amount of time working with object-oriented languages, you've probably run into examples of the Expression Problem.

如果您已经花费了大量的时间使用面向对象的语言，则您可能已经遇到了表达式问题的例子。

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Coined by Philip Wadler, the expression problem defines a program's data as a set of cases (types) and a set of operations over those cases.

表达式问题这个词是由Philip Wadler定义的，它将一个程序的数据定义为一组用例(类型)和对于这些用例的一组操作。

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We do have a problem with expression of free speech.

CENTERFORSECURITYPOLICY: Center For Security Policy

However, researchers say it is not clear whether compulsive internet use is a distinct problem or an expression of other underlying problems such as obsessive compulsive disorders.

BBC: NEWS | Technology | US shows signs of net addiction

"The Stolen Valor Act is a narrow law enacted to address an important problem, and it presents no threat to freedom of expression, " Justice Alito wrote.

WSJ: Supreme Court Strikes Down 'Stolen Valor' Law