核心对象一个正则表达式对象包含了匹配模式。
A regular expression object contains the pattern of a regular expression.
正则表达式对象存储用于搜索字符组合的字符串的模式。
Regular Expression objects store patterns used to search strings for character combinations.
OQL查询同样可以调用对象的方法，将正则表达式作为查询的一部分，并使用内置查询工具。
OQL queries can also invoke methods on the objects themselves, use regular expressions as part of the query, and use built-in query tools.
应用推荐