java 什么是控制字符的正则表达式？
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What is a regular expression for control characters?
提问by Cameron Tinker
I'm trying to match a control character in the form \^c where c is any valid character for control characters. I have this regular expression, but it's not currently working: \\[^][@-z]
我正在尝试以 \^c 形式匹配控制字符，其中 c 是控制字符的任何有效字符。我有这个正则表达式，但它目前不起作用：\\[^][@-z]
I think the problem lies with the fact that the caret character (^) is part of the regular expressions parsing engine.
我认为问题在于插入字符 (^) 是正则表达式解析引擎的一部分。
回答by tchrist
Match an ASCII text string of the form ^Xusing the pattern \^., nothing more. Match an ASCII text string of the form \^Xwith the pattern \\\^.. You may wish to constrain that dot to [?@_\[\]^\\], so \\\^[A-Z?@_\[\]^\\]. It's easier to read as [?\x40-\x5F]for the bracketed character class, hence \\\^[?\x40-\x5F]for a literal BACKSLASH, followed by a literal CIRCUMFLEX, followed by something that turns into one of the valid control characters.
^X使用 pattern匹配表单的 ASCII 文本字符串\^.，仅此而已。将表单的 ASCII 文本字符串\^X与模式匹配\\\^.。您可能希望将该点限制为[?@_\[\]^\\]，因此\\\^[A-Z?@_\[\]^\\]。[?\x40-\x5F]对于带括号的字符类，它更容易阅读，因此\\\^[?\x40-\x5F]对于文字 BACKSLASH，后跟文字 CIRCUMFLEX，然后是变成有效控制字符之一的某些内容。
Note that that is the result of printing out the pattern, or what you'd read from a file. It's what you need to pass to the regex compiler. If you have it as a string literal, you must of course double each of those backslashes. `\\\\\\^[?\\x40-\\x5F]"Yes, it is insane looking, but that is because Java does not support regexes directly as Groovy and Scala — or Perl and Ruby — do. Regex work is always easier without the extra bbaacckksslllllaasshheesssssess. :)
请注意，这是打印出模式的结果，或者您从文件中读取的内容。这是您需要传递给正则表达式编译器的内容。如果您将它作为字符串文字，您当然必须将每个反斜杠加倍。`\\\\\\^[?\\x40-\\x5F]"是的，它看起来很疯狂，但那是因为 Java 并不像 Groovy 和 Scala（或 Perl 和 Ruby）那样直接支持正则表达式。没有额外的 bbaackksslllllaashheesssssess，正则表达式的工作总是更容易。:)
If you had real control characters instead of indirect representations of them, you would use \pCfor all literal code points with the property GC=Other, or \p{Cc}for just GC=Control.
如果您有真正的控制字符而不是它们的间接表示，您将使用\pC属性为 GC=Other 的所有文字代码点，或\p{Cc}仅使用 GC=Control。
回答by gbvb
Check this out: http://www.regular-expressions.info/characters.html. You should be able to use \cA to \cZ to find the control characters..
看看这个：http: //www.regular-expressions.info/characters.html。您应该能够使用 \cA 到 \cZ 来查找控制字符。
