You might be asking why the \W+ is necessary: \b is the empty string at the beginning or end of a word.
您可能会提出疑问，为什么 \W+是必需的：\b 是位于单词开头或结尾的空字符串。
You're asking too much for this part. B: we have some cheaper ones.
这零件你们要价太高了。B：我们有便宜一点的。
How is school going? B: Very well, thanks. Thanks for asking.
你在学校里过得怎么样？B：过得很好，谢谢。谢谢你的关心。
How is school going? B: Very well, thanks. Thanks for asking.
你在学校里过得怎么样？B：过得很好，谢谢。谢谢你的关心。
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