java.lang.IllegalArgumentException: Illegal group reference

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java.lang.IllegalArgumentException: Illegal group reference
at java.util.regex.Matcher.appendReplacement(Matcher.java:554)
at java.util.regex.Matcher.replaceAll(Matcher.java:646)
at java.lang.String.replaceAll(String.java:1710)
at lianolink.translation.data.website.PHPFileGenerator.restoreDefines(PHPFileGenerator.java:93)

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