java 替换除一个以外的所有特殊字符
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Replace all special character except one
提问by ses
string = str.replaceAll("\W", " ")
This replace all special character by " " (space).
这用“”（空格）替换所有特殊字符。
But I try to exclude dash "-" as special character.
但我尝试排除破折号“-”作为特殊字符。
This my try:
这是我的尝试：
string = str.replaceAll("\W[^-]", " ")
But this not that I expect.
但这不是我所期望的。
Q: how do I make this work?
问：我如何使这项工作？
回答by Qtax
If you want to match all the characters except \wand -you can use:
如果要匹配除\wand之外的所有字符，-可以使用：
[^\w-]
For example:
例如：
str.replaceAll("[^\w-]+", " ")
回答by Ian Roberts
Qtax's answeris probably the simplest in this particular case, since there is a built in complement to \W, namely \w. But in general, it's useful to know that Java's regex engine supports "intersections" in character classes with the &&operator - you can say
在这种特殊情况下，Qtax 的答案可能是最简单的，因为 有一个内置的补充\W，即\w。但总的来说，知道 Java 的正则表达式引擎支持字符类与&&运算符的“交集”很有用- 你可以说
[\W&&[^-]]
to match a single character that is both a \Wanda [^-], i.e. a non-word character but not also a hyphen.
匹配单个字符既是一个\W和一个[^-]，即非字字符，但不也连字符。
回答by alex
Use a negated character class...
使用否定字符类...
string = str.replaceAll("[^\w-]", " ")
\Wis great for convenience, but when you need to add extra characters to your pool, you need to use a character class with \w.
\W非常方便，但是当您需要向池中添加额外的字符时，您需要使用带有\w.
The reason this doesn't work...
这不起作用的原因...
string = str.replaceAll("\W[^-]", " ")
...is because it's scanning for non-word characters ([^A-Za-z0-9_]) followed by nota -character. For example, /Awould be matched, but /-would not be.
......是因为它的扫描非单词字符（[^A-Za-z0-9_]），其次是没有一个-字符。例如，/A会匹配，但/-不会。
