切割字符串错误:Unclosed character class near index 0 [ ^ 转义符问题

 Exception in thread "main" java.util.regex.PatternSyntaxException: Unclosed character class near index 0 [ ^ 出现此错误应该是字符转义出现问题:java System.out.println(str.replaceAll("[", "22")); 解决方案:在[以前加上\\ Syste
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