编译原理实验 为UnLinker.java文件中的UnLinker类实现成员函数String clean(String text). 函数clean的功能是屏蔽字符串参数text中的网页链接信息，并返回屏蔽后的结果；如果无需屏蔽，则返回原来的字符串. 每个网页链接从左至右依次分成前缀，域名和后缀三部分-Compilation Principle experiment UnLinker.java file UnLinker class implements member functions String clean (String text).' s Function is to shield the function clean strings of web links in the text parameter information, and return the results screen　if no shielding is return to the original string each page link from left to right into the prefix, and suffix domain names of three parts