Java Regex, how do I replace \\ with \\\\?

Hello,
The following line doesn't work: someString.replaceAll("\\", "\\\\");
The error I get is the following:
Exception in thread "main" java.util.regex.PatternSyntaxException: Unexpected internal error near index 1
^
     at java.util.regex.Pattern.error(Unknown Source)
     at java.util.regex.Pattern.compile(Unknown Source)
     at java.util.regex.Pattern.<init>(Unknown Source)
     at java.util.regex.Pattern.compile(Unknown Source)
     at java.lang.String.replaceAll(Unknown Source)
     at TSPEngine.main(TSPEngine.java:34)
How do I fix this?
Thanks in advance,

Interference wrote:
Hello,
The following line doesn't work: someString.replaceAll("\\", "\\\\");
The error I get is the following:
Exception in thread "main" java.util.regex.PatternSyntaxException: Unexpected internal error near index 1"\\" is how you represent "\" in a String literal in Java, since "\" is an escape character. But "\" is also an escape character in regular expressions, meaning to represent a literal "\" in a Java regex you need "\\\\". Your second string should be fine since it's not interpreted as a regular expression to my knowledge.
Edit:
No, the second string DOES need to be "\\\\\\\\".
Edited by: endasil on 17-May-2010 11:46 AM

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