Java实现简单的正则表达式匹配

import java.util.regex.Pattern;

public class Test_REG {
    public static void main(String[] args) {
        //只允许输入6位数字
        String pattern = "[0-9]{6}";
        boolean isMatch = Pattern.matches(pattern, "123456");
        System.out.println(isMatch);
    }
}