FULL PRODUCT VERSION :
java version "1.7.0_67"
Java(TM) SE Runtime Environment (build 1.7.0_67-b01)
Java HotSpot(TM) 64-Bit Server VM (build 24.65-b04, mixed mode)

ADDITIONAL OS VERSION INFORMATION :
Microsoft Windows [Version 6.1.7601]

A DESCRIPTION OF THE PROBLEM :
            String s1 = "1234 abc 1234 abc";
            //Working well
            String s2 = s1.replaceAll("1234", "2345");
            System.out.println("s2: " + s2);

            //Working well
            String s3 = s1.replace("abc", "xzy\\");
            System.out.println("s3: " + s3);

            //Failed
            String s4 = s1.replaceAll("abc", "xzy\\");
            System.out.println("s4: " + s4);


Output:
s2: 2345 abc 2345 abc
s3: 1234 xzy\ 1234 xzy\
java.lang.StringIndexOutOfBoundsException: String index out of range: 4
at java.lang.String.charAt(String.java:658)
at java.util.regex.Matcher.appendReplacement(Matcher.java:762)
at java.util.regex.Matcher.replaceAll(Matcher.java:906)
at java.lang.String.replaceAll(String.java:2162)
at com.donriver.finance.kiftool.util.Test1.main(Test1.java:27)






REPRODUCIBILITY :
This bug can be reproduced always.