Replacing backslashes with something else in Java

The use of regular expression implemented in Java is messy when it comes to replacing '\' with something else. I have come across with a handy code example that shows how it could be done.

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public class DoubleTheBackslash {    public static void main(String[] args) {       String[] inputs = {"abc\\\\def", "abc\\def\\\\ghi"};               showReplacements(inputs, "(?<!\\\\)\\\\(?!\\\\)", "\\\\\\\\");       showReplacements(inputs, "(?<!\\\\)\\\\(?!\\\\)", "$0$0");       showReplacements(inputs, "([^\\\\])(\\\\)([^\\\\])", "$1\\\\\\\\$3");       showReplacements(inputs, "([^\\\\])(\\\\)([^\\\\])", "$1$2$2$3");    }         private static void showReplacements(String[] inputs,          String regex, String replaceWith) {       for (String input : inputs) {          System.out.println(input);          System.out.println(input.replaceAll(regex, replaceWith));          System.out.println();       }    } }