Java 中的正则表达式字符串“\\p{Cntrl}”匹配什么？
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What does the regex string "\\p{Cntrl}" match in Java?
提问by Wes Nolte
I think it's matching all control characters (not sure what "all" might be) but I can't be certain, nor can I find it in any documentation other than some musings in a Perl forum. Does anyone know?
我认为它匹配所有控制字符（不确定“全部”可能是什么），但我不能确定，除了 Perl 论坛中的一些思考之外，我也无法在任何文档中找到它。有人知道吗？
回答by aioobe
From the documentation of Pattern:
从文档Pattern：
\p{Cntrl}A control character:[\x00-\x1F\x7F]
\p{Cntrl}控制字符：[\x00-\x1F\x7F]
That is, it matches any character with hexadecimal value 00 through 1F or 7F.
也就是说，它匹配具有十六进制值 00 到 1F 或 7F 的任何字符。
The Wikipedia articleon control characters lists each character and what it's used for if you're interested.
回答by geekosaur
\p{name}matches a Unicode character class; consult the appropriate Unicode spec to see what code points are in the class. Hereis a discussion specific to the Java regex engine (Cntrlbeing one of the examples), although the same thing applies to many other regex engines.
\p{name}匹配一个 Unicode 字符类；查阅适当的 Unicode 规范以查看类中的代码点。 这里是针对 Java regex 引擎的讨论（Cntrl作为示例之一），尽管同样的事情适用于许多其他 regex 引擎。
