你需要在 Java 中转义 * 字符吗？
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Do You Need To Escape * Character in Java?
提问by This 0ne Pr0grammer
So I wrote a little section of code in a program of mine that uses the split method to parse out and sort the individual components held within a string. Below is a sample of the code:
所以我在我的程序中编写了一小段代码，该程序使用 split 方法来解析和排序字符串中的各个组件。下面是代码示例：
String[] sArray;
String delimiter = "*";
String test = "TEXT*TEXT*TEXT*";
String a = "";
String b = "";
String c = "";
sArray= test.split(delimiter);
a = sArray[0];
b = sArray[1];
c = sArray[2];
System.out.println("A is: " + a + "\nB is: " + b + "\nC is: " + c);
However, when I run this program, it returns an error stating that:
但是，当我运行这个程序时，它返回一个错误，指出：
Dangling meta character '*' near index 0
Dangling meta character '*' near index 0
So I googled this error and found it might be related to an issue with how *can be considered a wildcard character in regex. So I tried:
所以我用谷歌搜索了这个错误，发现它可能与如何*在正则表达式中被视为通配符的问题有关。所以我试过：
String delimiter = "\*"
String delimiter = "\*"
But that just returned another error stating:
但这只是返回了另一个错误，指出：
illegal escape character
illegal escape character
Has anyone ran into this issue before or know how you are (if you are) supposed to escape *in java?
有没有人以前遇到过这个问题，或者知道你（如果你）应该如何*在 Java 中逃脱？
回答by jlordo
You also have to escape the backslash:
您还必须转义反斜杠：
String delimiter = "\*";
Because the string literal "\\"is just a single backslash, so the string literal "\\*"represents an escaped asterisk.
因为字符串文字"\\"只是一个反斜杠，所以字符串文字"\\*"代表一个转义的星号。
回答by Stephen C
The way to understand the solution is to realize that there are two "languages" in play here. You have the language of regular expressions (Java flavour) in which *is a meta-character that needs to be escaped with a \to represent a literal *. That gives you
理解解决方案的方法是意识到这里有两种“语言”在起作用。您拥有正则表达式语言（Java 风格），其中*需要用 a 转义的元字符\来表示文字*。那给你
''\*'' // not Java yet ...
But you are trying to represent that string in the "language" of Java String literals where a \is the escape character. So that requires that any literal \(in whatever it is we are trying to represent) must be escaped. This gives you
但是您试图用 Java 字符串文字的“语言”来表示该字符串，其中 a\是转义字符。所以这要求\必须转义任何文字（无论我们试图表示的是什么）。这给你
"\*" // now Java ...
If you apply this approach/thinking consistently - "first do the regex escaping, then do the String literal escaping" - you won't get confused.
如果您始终如一地应用这种方法/思维——“首先进行正则表达式转义，然后进行字符串文字转义”——您就不会感到困惑。
回答by manisha mulchandani
You will have to attach "\" before "*" as if you want to represent "\" in java you have to use one more "\" before it.
你必须在“*”之前附加“\”，就像你想在java中代表“\”一样，你必须在它之前再使用一个“\”。
So, "\" represents:-----> "\" So if you want to use "" as delimiter the use "\"
所以，“\”代表：----->“\”所以如果你想使用“ ”作为分隔符使用“\”
Corrected Code:
更正的代码：
String delimiter = "\*";
String test = "TEXT*TEXT*TEXT*";
String a = "";
String b = "";
String c = "";
sArray= test.split(delimiter);
a = sArray[0];
b = sArray[1];
c = sArray[2];
System.out.println("A is: " + a + "\nB is: " + b + "\nC is: " + c);
OUTPUT:
输出：
A is: TEXT
B is: TEXT
C is: TEXT
A 是：文本
B 是：文本
C是：文本
