How to replace ” \ ” with ” \\ ” in java

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.

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