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import java.util.Scanner;
public class Test
{
/**
* @param args
*/
public static void main(String[] args)
{
// TODO Auto-generated method stub
Scanner can = new Scanner(System.in);
System.out.println(can.next().matches("[a-z\\,]+"));
}
}
(?i)^[a-z]([a-z,]*[a-z])*$
"(?i)^(?!,)[a-z0-9,]+(?<!,)$" //开头和结尾不能是分隔符
(?i)^[a-z][a-z,]*[a-z]$
(?m)^[a-zA-z\d,]*$