急求一个正则表达式！！！谢谢

Question

$re = "/^[a-zA-Z0-9]+([a-zA-Z]{2,4})?$/i";

Answer 1

eregi("^[a-zA-Z0-9_]+.+[a-zA-Z0-9]",$name)
临时写一个
你试一下$name="```ddd1.php";if(!eregi("^[a-zA-Z0-9_]+.+[a-zA-Z0-9]",$name))
{
echo "no";
}else{
echo "yes";
}

Answer 2

if(!preg_match("/^[a-zA-Z0-9]+([a-zA-Z]{2,4})?$/i",$savename))
{
echo "no";
}else{
echo "yes";
}
谢谢两位，我写成这样已经能正常运行了，感谢

Answer 3

我写那个漏了个点号
正确的应为
$re = "/^[a-zA-Z0-9]+(\.[a-zA-Z]{2,4})?$/i";