I have to replace " with \" in java , I tried
String.replaceall("\"","\\\"")
but it dint work
Thanks in advance
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Why? I usually find that these are non-questions, about operations that aren't necessary. Who is going to read this escaped quote? Only the Java compiler understands that.user207421– user2074212016-03-10 06:39:40 +00:00Commented Mar 10, 2016 at 6:39
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2 Answers
Assuming you want a literal \ then you need to escape it in your regular expression (the tricky part is that \ is itself the escape character). You can do something like,
String msg = "\"Hello\"";
System.out.println(msg);
msg = msg.replaceAll("\"", "\\\\\"");
System.out.println(msg);
Output (indicating the changing "s) is
"Hello"
\"Hello\"
1 Comment
Thilo
There is no need for a regular expression here, though. For simple text replacements, a
String#replace will do.According to the javadoc, replaceAll does regular expression matching. That means that the first parameter is treated as a regular expression, and the second parameter also has some characters with special meanings. See the javadoc.
The " character isn't special in regular expressions, so you don't need to do anything with it. But for the replacement expression, the backslash is special. If you have a replacement string and you don't want any of the characters to be treated as special, the easiest way is to use Matcher.quoteReplacement:
s.replaceAll("\"",Matcher.quoteReplacement("\\\""))
Also note that this doesn't modify s at all. replaceAll returns a string and you have to assign it to something (perhaps s, perhaps something else). (I don't know whether you were making that mistake or not, but it's a very common one on StackOverflow.)
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