Java replace " with \"

Question

I am trying to replace string containing " with \" , below is the program I tried

    String s="\"/test /string\"";
    s = s.replaceAll("\"", "\\\"");
    System.out.println(s);

But I get the same output as the string "/test /string". Why is my replace function is not working. If I do

   s = s.replaceAll("\"", "\\\\\"");

then I get the output I want \"/test /string\" . Why is the former dint work , even though in code I am trying to replace " with \"

possible duplicate of replace String with another in java

Robert MacLean
– Robert MacLean

2013-05-15 07:56:00 +00:00
Commented May 15, 2013 at 7:56 — Robert MacLean
– Robert MacLean, Commented May 15, 2013 at 7:56
possible duplicate of Java how to replace slash?

fglez
– fglez

2013-05-16 08:49:12 +00:00
Commented May 16, 2013 at 8:49 — fglez
– fglez, Commented May 16, 2013 at 8:49

Jon Skeet · Accepted Answer · 2012-10-10 09:17:16Z

10

You're using String.replaceAll, which takes a regular expression as its inputs, including the replacement. As documented in Match.replaceAll():

Note that backslashes (\) and dollar signs ($) in the replacement string may cause the results to be different than if it were being treated as a literal replacement string.

You're really just trying to do a straight replace with no regexes involved, so use String.replace instead:

s = s.replace("\"", "\\\"");

answered Oct 10, 2012 at 9:17

Jon Skeet

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