Java String.replaceAll 不会用转义引号替换引号
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Java String.replaceAll doesn't replace a quote with escaped quote
提问by frosty
Having a hard time replacing a quote with an escaped quote. I have a string that has the value of 'Foo "bar" foobar', and I am trying to replace the quotes around bar with escaped quotes, and it isn't working. I am going crazy.
很难用转义的引用替换引用。我有一个值为 'Foo "bar" foobar' 的字符串，我试图用转义引号替换 bar 周围的引号，但它不起作用。我快疯了。
s=s.replaceAll("\"","\\"");
I would expect s to have the value of 'foo \"bar\" foobar', but it doesn't. Any help?
我希望 s 具有 'foo \"bar\" foobar' 的值，但事实并非如此。有什么帮助吗？
回答by Jon Skeet
replaceAlluses regular expressions - in which the backslash just escapes the next character, even in the replacement.
replaceAll使用正则表达式 - 其中反斜杠只是转义下一个字符，即使在替换中也是如此。
Use replaceinstead and it's fine... or you can double the backslash in the second argument if you want to use the regular expression form:
改用replace它就好了......或者如果你想使用正则表达式形式，你可以在第二个参数中加倍反斜杠：
String after = before.replaceAll("\"", "\\\"");
This could be useful if you need to match the input using regular expressions, but I'd strongly recommend using the non-regex form unless you actually needregex behaviour.
如果您需要使用正则表达式匹配输入，这可能很有用，但我强烈建议使用非正则表达式形式，除非您确实需要正则表达式行为。
Personally I think it was a mistake for methods in Stringto use regular expressions to start with - things like foo.split(".")which will split on every characterrather than on periods, completely unexpectedly to the unwary developer.
就我个人而言，我认为String开始使用正则表达式的方法是错误的- 诸如foo.split(".")将在每个字符而不是句点上拆分的事情，对于粗心的开发人员来说完全出乎意料。
回答by Bozho
Use s = s.replace("\"", "\\\"");, which is the non-regex version.
使用s = s.replace("\"", "\\\"");，这是非正则表达式版本。
回答by Ralph
You need to escape both replace all arguments because they are regex!
您需要同时转义替换所有参数，因为它们是正则表达式！
@Test
public void testReplace() {
assertEquals("foo\\"bar\\"",
"foo\"bar\"".replaceAll("\\"", "\\\\""));
}
So if you want to write "you need to escape the regex -> \"but because you are in java you need to escape the \and "for java to, so you get \\\\". (that is the search parameter).
所以如果你想写"你需要转义正则表达式 ->\"但是因为你在 java 中你需要转义\和"for java to，所以你得到\\\\". （即搜索参数）。
For the replace parameter you want to have \"-> in regex: \\\"-> in Java \\\\\\\"
对于您想要的替换参数\"-> 在正则表达式中：\\\"-> 在 Java 中\\\\\\\"
回答by Taha
String str = "'Foo \"Bar\" Bar'";
System.out.println(str);
System.out.println(str.replaceAll("\"", "\\\""));
回答by Fabian Barney
s=s.replaceAll("\"","\\\"");
But you should really go with replace(...)as the others here advice.
但你真的应该replace(...)按照其他人的建议去。
回答by Prabath Siriwardena
Use;
利用;
s=s.replaceAll("\"","\\\"");
回答by developer
please follow below program and use > s.replace("/"."//");
请遵循以下程序并使用 > s.replace("/"."//");
public class stringbackslash {
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
String s="\";
s=s.replace("\", "\");
System.out.println(s);
}
}
