Java 无法全部替换为美元符号
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Not able to replace all for dollar sign
提问by Sillicon.Dragons
can anyone advise why i encountered index out of bouns exception when running this method to replace the value by $sign?
任何人都可以告诉我为什么在运行此方法以按$符号替换值时遇到 index out of bouns 异常？
E.g. i pass in a message $$vmdomodm$$
例如我传递了一条消息 $$vmdomodm$$
message = message.replaceAll("$", "$");
I tried to look at this forum thread but couldnt understand the content
我试图看这个论坛帖子，但无法理解内容
http://www.coderanch.com/t/383666/java/java/String-replaceAll
http://www.coderanch.com/t/383666/java/java/String-replaceAll
采纳答案by Jigar Joshi
It is special character you need to use escape character
这是您需要使用转义字符的特殊字符
Try with this \\$
试试这个 \\$
and it doesn't make sense in your code you are trying to replacing the content with same
并且在您尝试用相同内容替换内容的代码中没有意义
String message = "$$hello world $$";
message = message.replaceAll("\$", "_");
System.out.println(message);
output
输出
__hello world __
Update
更新
String message = "$hello world $$";
message = message.replaceAll("$", "\$");
System.out.println(message);
output
输出
$hello world $$
回答by anubhava
Since you're not really using any regex so instead of replaceAll you should be using String#replacemethod like this:
由于您并没有真正使用任何正则表达式，因此您应该使用String#replace方法代替 replaceAll，如下所示：
message = message.replace("$", "$");
回答by silverduck
After tinkering around with replaceAll() and never getting what I wanted I figured it would be easier to write a function to escape the dollar signs.
在修改了 replaceAll() 并且从未得到我想要的东西之后，我认为编写一个函数来逃避美元符号会更容易。
public static String escapeDollarSign(String value) {
Pattern p = Pattern.compile("\$");
int off = 0;
while (true) {
Matcher m = p.matcher(value.substring(off));
if (!m.find()) break;
int moff = m.start();
String left = value.substring(0, off+moff);
String right = value.substring(off+moff+1, value.length());
value = left+"\$"+right;
off += moff+1+1;
}
return value;
}
e.g.$re$gex $can $ b$e a$ pain$
becomes\$re\$gex \$can \$ b\$e a\$ pain\$
例如$re$gex $can $ b$e a$ pain$
变成\$re\$gex \$can \$ b\$e a\$ pain\$
