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via Stack Overflow by DarthVader
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via Stack Overflow by lightheat
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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)