How Do I Properly Escape Backslashes in Java Strings?

Escaping Backslashes in Strings Using String.replaceAll

When attempting to convert a string containing a single backslash () to a string with a double backslash (), the String.replaceAll method may encounter errors. This is because the character serves as an escape character in both strings and regular expressions.

To resolve this issue, it's necessary to double-escape the backslash in the regular expression like so:

string.replaceAll("\\", "\\\\");

Alternatively, if you do not require pattern matching and simply want a character-by-character replacement, you can use the String.replace method:

string.replace("\", "\\");

However, it's crucial to keep in mind that backslashes also hold significance in JavaScript. If you intend to use the modified string in a JavaScript context, you may consider using the StringEscapeUtils#escapeEcmaScript method for more comprehensive character escaping.

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