Java 如何替换所有星号？
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/3860049/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
How do I replace all asterisks?
提问by Tim
In Java, I want to replace all *characters with \*.
在 Java 中，我想将所有*字符替换为\*.
Example:
Text: select * from blah
示例： 文本： select * from blah
Result: select \\* from blah
结果： select \\* from blah
public static void main(String[] args) {
String test = "select * from blah";
test = test.replaceAll("*", "\*");
System.out.println(test);
}
This does not work, nor does adding a escape backslash.
这不起作用，添加转义反斜杠也不起作用。
回答by Tim
I figured it out
我想到了
String test = "select * from blah *asdf";
test = test.replaceAll("\*", "\\*");
System.out.println(test);
回答by RonU
For those of you keeping score at home, and since understanding the answer may be helpful to someone else...
对于那些在家里记分的人，因为理解答案可能对其他人有帮助......
String test = "select * from blah *asdf";
test = test.replaceAll("\*", "\\*");
System.out.println(test);
works because you must escape the special character *in order to make the regular expression happy. However, \is a special character in a Java string, so when building this regex in Java, you must also escape the \, hence \\*.
之所以有效，是因为您必须转义特殊字符*才能使正则表达式满意。但是，\是 Java 字符串中的特殊字符，因此在 Java 中构建此正则表达式时，您还必须转义\，因此\\*.
This frequently leads to what amounts to double-escapes when putting together regexes in Java strings.
在将 Java 字符串中的正则表达式组合在一起时，这通常会导致双重转义。
回答by Sean Patrick Floyd
You don't need any regex functionality for this, so you should use the non-regex version String.replace(CharSequence, CharSequence):
您不需要任何正则表达式功能，因此您应该使用非正则表达式版本String.replace(CharSequence, CharSequence)：
String test = "select * from blah *asdf";
test = test.replace("*", "\*");
System.out.println(test);
