java.lang.IllegalArgumentException: Illegal group reference

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java.lang.IllegalArgumentException: Illegal group reference
at java.util.regex.Matcher.appendReplacement(Matcher.java:713)
at java.util.regex.Matcher.replaceAll(Matcher.java:813)
at java.lang.String.replaceAll(String.java:2190)
at demo.BugDemo.main(BugDemo.java:16)

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