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以前在chinaunix回答过这样一个问题，用到了正则表达式（而且我认为正则式解决此类问题是最合适的。）
学英语的一些例句，每句都有若干词根相同的词，例如 She swears to wear the pearls that appear to be pears. 但是每句的词根都未必相同；我希望把这些包含词根的词都标记出来，请问如何写？
这里说的词根不是原本词根的定义，只是一组字母序列，比如
9. The dust in the industrial zone frustrated the industrious man.
词根是dust或ust
10. The just budget judge just justifies the adjustment of justice.
词根是dust
11. I used to abuse the unusual usage, but now I’m not used to doing so.
词根是use，有变形
12. The lace placed in the palace is replaced first, and displaced later.
词根是lace
13. I paced in the peaceful spacecraft.
词根是pace
14. Sir, your bird stirred my girlfriend’s birthday party.
词根是ir
如果您对此问题感兴趣，请独立思考后再继续阅读本站提供的解决方法。
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