Replacing single '\' with '\\' in Java

Question

How do I replace a single \'\\\' with \'\\\\\'? When I run replaceAll() then I get this error message.

Exception in t         


        

Answer 1

You could use Pattern.quote to make it easier for you to escape the value, such as:

str = str.replaceAll(Pattern.quote("\\"), Matcher.quoteReplacement("\\\\"));

or, you can just use String.replace:

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

See: Pattern.quote, String.replace and Matcher.quoteReplacement