object match 目标匹配
The Match object is used to retrieve the group that is specified.
Match对象用于检索指定的组。
The parser reports the success or failure to its client through a match object.
分析器通过匹配对象来通知客户程序分析的成功与否。
Instead of testing for a match, however, a match object is created for the first match found in the input string.
然而,Match对象并非用于测试匹配而是为在输入字符串中找到的第一个匹配项创建的。
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