How to Replace ' \' with '/' in a Java String [Duplicate]

If it is a file path, you should try "File.separator" instead of '\' (in case your application works with Nix platform)

Your path=path.replaceAll('\','/'); will not compile, because you have to escape the backslash,

use path=path.replace('\\','/'); (it will replace all Occrurences, see JavaDoc)

or path=path.replaceAll("\\\\", "/"); (this regex escapes the backslash) ;-)

In the comments there is an explanation, why you need 4 of "\" to make the correct regex for one "\".

You should use the replace method and escape the backslash:

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

See documentation:

public String replace(char oldChar, char newChar)

Returns a new string resulting from replacing all occurrences of oldChar in this string with newChar.

As it is a file path you have absolutely no need whatsoever to do this operation at all. Java understands both syntaxes. If you are trying to convert a File to a URL or URI, it has methods to do that.

the \ is not just some character in java.

it has its significance, some characters when preceeded by \ have a special meaning,

refer here section escape sequence for details

Thus if you want to use just \ in your code, there is an implementation \\ for it.

So replace

path=path.replaceAll("\","/") 

with

path=path.replaceAll("\\","/") 

And this will fail during execution giving you a PatternSyntaxException, because the first String is a regular expression So based on @jlordo answer , this is the way to go

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

   String s="m/j/"; 
   String strep="\\\\";
   String result=s.replaceAll("/", strep);
    System.out.println(result);