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String str = "abn你好啊！<>在干嘛？123abscdasdasdhuihsad1$$$$$$**&^%&^wwwwww12348548";
String after = str.replaceAll("[a-zA-z0-9<>$&^*%]","");
Log.d("string_replaceAll_after",after);
日志打印出来的结果
com.example.administrator.myapplication D/string_replaceAll_after: 你好啊！在干嘛？