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正则匹配不正确？该如何解决

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Release： 2016-06-13 13:39:17
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正则匹配不正确？

PHP code
<!--

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-->
if(! preg_match($user_name,'/[^\a-\z\A-\Z0-9\_@\.]/g'))
{
echo '不允许出现中文';
}
Copy after login

上述代码不能验证用户名不是英文数字下划线组成

------解决方案--------------------
参数顺序都反了
------解决方案--------------------
if(!preg_match('/^[a-z0-9_]+$/i',$user))
{
echo '不允许出现中文';
}

这样试试。
Related labels：
code echo match user
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