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We focus on the research of query modification by applying security constraints.
本文重点研究了多级安全环境下，利用约束处理来实现查询处理的方法。
This section of the article will use several examples to demonstrate how query modification can be implemented.
文章的这个部分，使用几个例子，解释了怎样操作自定义查询。
The first step is to create a compatible regular expression out of each query word, although modification is only required if the word contains a wildcard character: *.
第一步是创建与每个查询词一致的正则表达式，只有在查询词包含通配符 * 时才需要修改。
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