在 Java 中用 '\\' 替换单个 '\'
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Replacing single '\' with '\\' in Java
提问by Husain Sanwerwala
How do I replace a single '\'with '\\'? When I run replaceAll()then I get this error message.
如何更换一个'\'带有'\\'？当我运行时，replaceAll()我收到此错误消息。
Exception in thread "main" java.util.regex.PatternSyntaxException:
Unexpected internal error near index 1 \
^
at java.util.regex.Pattern.error(Pattern.java:1713)
at java.util.regex.Pattern.compile(Pattern.java:1466)
at java.util.regex.Pattern.<init>(Pattern.java:1133)
at java.util.regex.Pattern.compile(Pattern.java:823)
at java.lang.String.replaceAll(String.java:2190)
at NewClass.main(NewClass.java:13)
Java Result: 1
My code:
我的代码：
public class NewClass {
public static void main(String[] args) {
String str = "C:\Documents and Settings\HUSAIN\My Documents\My Palettes";
str = str.replaceAll("\", "\\");
System.out.println(str);
}
}
回答by Mike
String.replaceAll(String,String)is regex.String.replace(String,String)will do what you want.
String.replaceAll(String,String)是正则表达式。String.replace(String,String)会做你想做的。
The following...
下列...
String str = "C:\Documents and Settings\HUSAIN\My Documents\My Palettes";
System.out.println(str);
str = str.replace("\", "\\");
System.out.println(str);
Produces...
产生...
C:\Documents and Settings\HUSAIN\My Documents\My Palettes
C:\\Documents and Settings\\HUSAIN\\My Documents\\My Palettes
C:\Documents and Settings\HUSAIN\My Documents\My Palettes
C:\\Documents and Settings\\HUSAIN\\My Documents\\My Palettes
回答by Adam Sznajder
\is also a special character in regexp. This is why you should do something like this:
\也是正则表达式中的一个特殊字符。这就是为什么你应该做这样的事情：
str = str.replaceAll("\\", "\\\\");
回答by Javier Diaz
You have to first scape the \for the string and then scape it for the regex, it would be \\\\for each slash.
您必须首先\为字符串转义，然后为正则表达式转义它，这将\\\\用于每个斜杠。
回答by JB Nizet
In a String literal, \must be escaped with another \. And in a reges, a \must also be escaped by another \\. So, you must escape every \four times: \\\\.
在字符串文字中，\必须用另一个\. 在 a reges 中， a\也必须被 another 转义\\。因此，您必须每\四次转义：\\\\.
Another way is to use Pattern.quote("\\")(for the regex) and Matcher.quoteReplacement("\\\\")for the replacement string.
另一种方法是使用Pattern.quote("\\")（用于正则表达式）和Matcher.quoteReplacement("\\\\")用于替换字符串。
回答by Tom Leese
You could use Pattern.quoteto make it easier for you to escape the value, such as:
您可以使用Pattern.quote使您更容易转义该值，例如：
str = str.replaceAll(Pattern.quote("\"), Matcher.quoteReplacement("\\"));
or, you can just use String.replace:
或者，您可以只使用String.replace：
str = str.replace("\", "\\");
See: Pattern.quote, String.replaceand Matcher.quoteReplacement
回答by Manish Giri
filePath = filePath.replaceAll(Matcher.quoteReplacement("\"), Matcher.quoteReplacement("\\"));
filePath = filePath.replaceAll(Matcher.quoteReplacement("\"), Matcher.quoteReplacement("\\"));
This one worked perfectly. filePath = C:\abc\
这个工作得很好。文件路径 = C:\abc\
