Java replaceAll() 方法来转义特殊字符
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Java replaceAll() method to escape special characters
提问by Abhishek Goel
I am using java replaceAll()method to escape new line characters
我正在使用 javareplaceAll()方法来转义换行符
String comment = "ddnfa \n \r \tdnfadsf ' \r t ";
comment = comment.replaceAll("(\n|\r|\t)","\\");
System.out.println(comment);
But the above code is still inserting new line.
但是上面的代码仍然插入新行。
Is there a way to output the comment exactly the same (i.e. with \nand \rinstead of inserting new line)?
有没有办法输出完全相同的注释（即使用\n和\r而不是插入新行）？
UPDATE:
更新：
I ended up using:
我最终使用了：
comment = comment.replaceAll("\n","\\n")
.replaceAll("\r","\\r")
.replaceAll("\t","\\t");
回答by x4rf41
you will have to do it character by character:
您必须逐个执行此操作：
comment = comment.replaceAll("\n","\\n");
comment = comment.replaceAll("\r","\\r");
comment = comment.replaceAll("\t","\\t");
another solution is to escape the String as a Java String using this function:
另一个解决方案是使用此函数将字符串转义为 Java 字符串：
comment = org.apache.commons.lang.StringEscapeUtils.escapeJava(comment);
This will make the String look exactly like the String in the Java Code, but it will also show other escape sequences (like \\, \"etc).
But maybe thats exactly what you want
这将使字符串看起来就像字符串中的Java代码，但它也会显示其他转义序列（如\\，\"等）。但也许这正是你想要的
回答by Joni
You'll have to go one-by-one, since the new-line character U+000A has nothing to do with the two-character escape sequence \n:
您必须一一进行，因为换行符 U+000A 与两个字符的转义序列无关\n：
comment = comment.replaceAll("\n","\\n");
comment = comment.replaceAll("\r","\\r");
comment = comment.replaceAll("\t","\\t");
回答by AJJ
Try this..
尝试这个..
comment.replaceAll("(\n)|(\r)|(\t)", "\n");
回答by cl-r
It is a \problem, simplify like this :
这是一个\问题，简化成这样：
comment = comment.replaceAll("(\n|\r|\t)", "");
output :
输出 ：
ddnfa dnfadsf ' t
回答by falsetru
Hard way: using Matcher
困难的方法：使用 Matcher
String comment = "ddnfa \n \r \tdnfadsf ' \r t ";
Map<String,String> sub = new HashMap<String,String>();
sub.put("\n", "\\n");
sub.put("\r", "\\r");
sub.put("\t", "\\t");
StringBuffer result = new StringBuffer();
Pattern regex = Pattern.compile("\n|\r|\t");
Matcher matcher = regex.matcher(comment);
while (matcher.find()) {
matcher.appendReplacement(result, sub.get(matcher.group()));
}
matcher.appendTail(result);
System.out.println(result.toString());
prints
印刷
ddnfa \n \r \tdnfadsf ' \r
回答by user4881671
Why you dont use Matcher.quoteReplacement(stringToBeReplaced);?
你为什么不使用Matcher.quoteReplacement(stringToBeReplaced);？
