函数与表达式(FUNCTIONS AND EXPRESSIONS) JPQL支持函数功能，多种的IN，LIKE和BETWEEN样式表达式，及面向集合(collection)的条件表达式。
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当请求类型与正规表达式匹配时，就会调用处理器函数。
The handler function is called when the request type and the regular expression match.
与尝试用正则表达式和字符串函数手动完成此工作相比，使用 filter_var() 函数将极大地减少编码量。
The filter_var() function greatly reduces the amount of coding compared to if you were to try to do this manually with a regular expression and string functions.
XQuery 函数与 XPath 表达式的结合为实现搜索需求提供了强大的搜索机制。
XQuery functions combined with XPath expressions provide a powerful search mechanism for implementing the search requirements.
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