How to replace " \ " with " \\ " in java

Question

I tried to break the string into arrays and replace \ with \\ , but couldn't do it, also I tried String.replaceAll something like this ("\","\\");.

I want to supply a path to JNI and it reads only in this way.

Answer 1

Don't use String.replaceAll in this case - that's specified in terms of regular expressions, which means you'd need even more escaping. This should be fine:

String escaped = original.replace("\\", "\\\\");

Note that the backslashes are doubled due to being in Java string literals - so the actual strings involved here are "single backslash" and "double backslash" - not double and quadruple.

replace works on simple strings - no regexes involved.

Answer 2

You could use replaceAll:

String escaped = original.replaceAll("\\\\", "\\\\\\\\");