java.lang.IllegalArgumentException: Illegal group reference at java.util.regex.Matcher.appendExpandedReplacement(java.base@9-ea/Matcher.java:1068) at java.util.regex.Matcher.appendReplacement(java.base@9-ea/Matcher.java:998) at java.util.regex.Matcher.replaceAll(java.base@9-ea/Matcher.java:1181) at java.lang.String.replaceAll(java.base@9-ea/String.java:2162)

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Illegal group reference at java.util.regex.Matcher.appendExpandedReplacement(java.base@9-ea/Matcher.java:1068) at java.util.regex.Matcher.appendReplacement(java.base@9-ea/Matcher.java:998) at java.util.regex.Matcher.replaceAll(java.base@9-ea/Matcher.java:1181) at java.lang.String.replaceAll(java.base@9-ea/String.java:2162)
java.lang.IllegalArgumentException: Illegal group reference at java.util.regex.Matcher.appendExpandedReplacement(java.base@9-ea/Matcher.java:1068) at java.util.regex.Matcher.appendReplacement(java.base@9-ea/Matcher.java:998) at java.util.regex.Matcher.replaceAll(java.base@9-ea/Matcher.java:1181) at java.lang.String.replaceAll(java.base@9-ea/String.java:2162)
at undefined.JI9042279.main(JI9042279.java:6)

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