正则匹配输入只能包含小写字母和.,以字母开头/结尾

import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class CC {

    public static void main(String[] args) {

        String s="asssse.rtets.ss.s.e";

        String regex="^[a-z]+[a-z.]+[a-z]$";

        Pattern p=Pattern.compile(regex);

        Matcher m=p.matcher(s);

        if(m.matches()){

            System.out.println(m.group());

        }

    }

}