其中一个技巧是子表达式开始处的？：运算符。
One such trick is the? : operator at the beginning of a subexpression.
您还将通过使用这里展示的技巧来“翻译”正则表达式。
Using the technique I'm showing you, you'll also "translate" the regular expression.
如果您必须在正则表达式处理过程中处理Unicode, Wilson提供了一些值得看的技巧。
If you have to handle Unicode in your regular expression processing, Wilson supplies a few tricks worth looking at.
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