正则表达式验证老是失败
<body><br />
<?php<br />
if(!empty($_POST[sub]))<br />
{<br />
<br />
if(ereg("\d{10}", $_POST[username]))<br />
<br />
{echo "验证通过。";}<br />
else<br />
{echo "验证失败";}<br />
}<br />
?><br />
<form action="" method="post"><br />
用户名<input type="text" name="username"><br><br />
<input type="submit" name="sub" value="提交"><br />
</form><br />
</body>
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