正则过滤字母、数字、汉字

1.过滤出汉字

                 String chin = "张帆12211112114";

chin = chin.replaceAll("[^(\\u4e00-\\u9fa5)]", "");

System.out.println(chin);   //输出为张帆

2.过滤出数字

chin = chin.replaceAll("[^(0-9)]", "");

System.out.println(chin);   //输出为12211112114

3.过滤出字母

                String chin = "张帆12211aa1121b14";

chin = chin.replaceAll("[^(A-Za-z)]", "");

System.out.println(chin);                   //输出为aab