java.util.regex.PatternSyntaxException: Dangling meta character '?' near index 30 \[([^\|\[\]]*\| *)?(?:mod4:)???(#[^\]]*)?\] ^

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java.util.regex.PatternSyntaxException: Dangling meta character '?' near index 30 \[([^\|\[\]]*\| *)?(?:mod4:)???(#[^\]]*)?\] ^
at java.util.regex.Pattern.error(Pattern.java:1650)

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