Perl 5正则表达式要指明的或者是“寻找此内容”，或者是“寻找此内容，并用另一内容取代之”。
The point of Perl 5 regular expressions is to say either "look for this," or "look for this and replace it with that."
此句话比什么都重要。美德是集众善之链，是一切幸福的中心。
So is all said at once. Virtue is the link of all perfections, the center of all the felicities.
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