验证用户名长度的正则表达式

用户名可能包含中文,中文按2位算

代码下载地址：http://www.zuidaima.com/share/1550463222516736.htm

转载请注明出处:验证用户名长度的正则表达式

运行此代码截图如下:

满足此表达式:

不满足此表达式:

package com.zuidaima.regularexpression;

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
	 * 
	 * @param userName
	 * @return
	 */
	public static boolean validateUserName(String userName) {
		String validateStr = "^[\w\-－＿[０-９]u4e00-u9fa5uFF21-uFF3AuFF41-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最代码zuidaima.com";
		String st = "Ａ-ｄｑ_!!！！去符号标号！ノチセたのひちぬ！当然。!!..**半角最代码zuidaima.com";

		System.out.println(validateUserName(str));
		System.out.println(st.replaceAll("[\pP&&[^-_]]", ""));
		System.out.println(st.replaceAll("[\w\-一-龥Ａ-Ｚａ-ｚ]", ""));
	}
}