java提取字符串中汉字、数字、字母

import java.util.regex.*;//匹配汉字、字符串、数字public class Test9 {public static void main(String[] args) {String regEx1 = "[\\u4e00-\\u9fa5]";String regEx2 = "[a-z||A-Z]";String regEx3 = "[0-9]";String str = "1 2fdAsz我是hhhZ大傻逼";String s1 = matchResult(Pattern.compile(regEx1),str);String s2 = matchResult(Pattern.compile(regEx2),str);String s3 = matchResult(Pattern.compile(regEx3),str);System.out.println(s1+"\n"+s2+"\n"+s3);} public static String matchResult(Pattern p,String str){StringBuilder sb = new StringBuilder();Matcher m = p.matcher(str);while (m.find())for (int i = 0; i <= m.groupCount(); i++) {sb.append(m.group());   }return sb.toString();}}