java代码验证用户名，支持中英文（包括全角字符）、数字、下划线和减号 （全角及汉字算两位）,长度为4-20位,中文按二位计数

package com.sangedabuliu.www;
 
import java.util.regex.Matcher;
import java.util.regex.Pattern;
 
public class UserReg {
    /**
     * 验证用户名，支持中英文（包括全角字符）、数字、下划线和减号 （全角及汉字算两位）,长度为4-20位,中文按二位计数
     * @author www.sangedabuliu.com
     * @param userName
     * @return
     */
    public static boolean validateUserName(String userName) {
        String validateStr = "^[\\w\\-－＿[０-９]\u4e00-\u9fa5\uFF21-\uFF3A\uFF41-\uFF5A]+$";
        boolean rs = false;
        rs = matcher(validateStr, userName);
        if (rs) {
            int strLenth = getStrLength(userName);
            if (strLenth < 4 || strLenth > 20) {
                rs = false;
            }
        }
        return rs;
    }
 
    /**
     * 获取字符串的长度，对双字符（包括汉字）按两位计数
     * 
     * @param value
     * @return
     */
    public static int getStrLength(String value) {
        int valueLength = 0;
        String chinese = "[\u0391-\uFFE5]";
        for (int i = 0; i < value.length(); i++) {
            String temp = value.substring(i, i + 1);
            if (temp.matches(chinese)) {
                valueLength += 2;
            } else {
                valueLength += 1;
            }
        }
        return valueLength;
    }
 
    private static boolean matcher(String reg, String string) {
        boolean tem = false;
        Pattern pattern = Pattern.compile(reg);
        Matcher matcher = pattern.matcher(string);
        tem = matcher.matches();
        return tem;
    }
 
    public static void main(String[] args) {
        String str = "０－＿ｆ９ｚｄ中22";
        String st = "Ａ-ｄｑ_!!！！去符号标号！ノチセたのひちぬ！当然。!!..**半角";
 
        System.out.println(validateUserName(str));
        System.out.println(st.replaceAll("[\\pP&&[^-_]]", ""));
        System.out.println(st.replaceAll("[\\w\\-一-龥Ａ-Ｚａ-ｚ]", ""));
    }
}