第三周：正则表达式

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使用正则表达式验证用户名

package com.citymango.regex;import java.util.regex.Matcher;import java.util.regex.Pattern;public class UsernameValidator {private Pattern pattern;private Matcher matcher;private static final String USERNAME_PATTERN = "^[a-z0-9_-]{3,15}$";public UsernameValidator() {pattern = Pattern.compile(USERNAME_PATTERN);}/*使用正则表达式验证用户名* @param username 用来验证的用户名* @return 用户名有效返回true，无效则返回false*/public boolean validate(final String username){matcher = pattern.matcher(username);return matcher.matches();}}

使用正则表达式验证密码

package com.citymango.regex; import java.util.regex.Matcher; import java.util.regex.Pattern; public class PasswordValidator { private Pattern pattern; private Matcher matcher; private static final String PASSWORD_PATTERN = "((?=.*\\d)(?=.*[a-z])(?=.*[A-Z])(?=.*[@#$%]).{6,20})"; public PasswordValidator() { pattern = Pattern.compile(PASSWORD_PATTERN); } public boolean validate(final String password) { matcher = pattern.matcher(password); return matcher.matches(); } }

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