验证用户名长度的正则表达式

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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-\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]", ""));}}

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