Question

Why does this string problem occur only in windows?

How do I replace the file seperator?
Both of the below methods are not working for me.

The error is:

java.util.regex.PatternSyntaxException: Unexpected internal error near
index 1.

String s ="pathoffile";

if(File.separator.equals("\\"))
   s= s.replaceAll(File.separator,"/");


if(File.separator.equals("\\"))
   s= s.replaceAll("\\","/");

Answer 1

You need to escape a backslash in a regular expression twice:

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

Once, to put a backslash into a String.

Twice, because regular expressions have special character classes, like \d, and those start with a backslash, so a literal backslash is \\.

But what you should probably really do is not use a regular expression at all to just replace single characters:

s = s.replace('\\', '/');