Error replacing strings with \ in them

I get the following error:
Exception in thread "AWT-EventQueue-0" java.lang.StringIndexOutOfBoundsException
: String index out of range: 1
        at java.lang.String.charAt(Unknown Source)
        at java.util.regex.Matcher.appendReplacement(Unknown Source)
        at java.util.regex.Matcher.replaceAll(Unknown Source)
        at java.lang.String.replaceAll(Unknown Source)
        at Main.runCommand(Main.java:106)It occurs in the following for loop of my program:
String tshow = "";
            for(int i = 1; i < org.size(); i++) {
                tshow += " " + org.get(i).replaceAll("\\s", " ").replaceAll("\\n", "\n").replaceAll("\\\\", "\\");;
            }If I do not use a \ (which is placed in the vector org) then everything runs fine. But if I just place one \, even if I don't type \n or \\ or \s, then it throws that error.
For example, if org.get(1); is "blah\", then the error will be thrown.
Why does this happen? I can change the \\ to / instead, but I don't understand.

Here is some more of my code to show you why i set i equal to 1:
       String comm = org.get(0);
        System.out.println(org.get(1));
        if(comm.equals("run")) {
            fileRun(org.get(1));
        } else if(comm.equals("print")) {
            String tshow = "";
            for(int i = 1; i < org.size(); i++) {
                tshow += " " + org.get(i).replaceAll("\\s", " ").replaceAll("\\n", "\n").replaceAll("\\\\", "\\");;
            ios.showText(tshow);
        }

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