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 fm.split("[");  // error
-------------------
java.util.regex.PatternSyntaxException: Unclosed character class near index 0[+
   ^
    at java.util.regex.Pattern.error(Unknown Source)
    at java.util.regex.Pattern.clazz(Unknown Source)
    at java.util.regex.Pattern.clazz(Unknown Source)
   ===========================
 
 fm.split("\\["); //ok
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