Exception in thread "main" java.util.regex.PatternSyntaxException: Unclosed character class near index 0 [ ^

时间：2016-10-16 00:50:02 收藏：0 阅读：3111

出现此错误应该是字符转义出现问题：

System.out.println(str.replaceAll("[", "22"));

解决方案：在[之前加上\\

System.out.println(str.replaceAll("\\[", "22"));

原文：http://www.cnblogs.com/wangchaoyuan/p/5965460.html

Exception in thread &quot;main&quot; java.util.regex.PatternSyntaxException: Unclosed character class near index 0 [ ^