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正则表达式验证老是失败

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Release： 2016-06-23 14:12:40
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<body>        <?php        if(!empty($_POST[sub]))        {                    if(ereg("\d{10}", $_POST[username]))                {echo "验证通过。";}        else        {echo "验证失败";}        }        ?>        <form action="" method="post">    用户名<input type="text" name="username"><br>    <input type="submit" name="sub" value="提交"></form>    </body>
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回复讨论(解决方案)

我要验证一个位数为10位的数字、

if(preg_match("/^\d{10}$/", $_POST[username]))

现在还能用ereg么？

ereg(" [0-9]{10}", $_POST[username])

现在还能用ereg么？
求问大神？为什么不使用了？

Deprecated:  Function ereg() is deprecated 
Deprecated 已过时

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正则表达式验证老是失败
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