【正则表达式】php验证用户名是否是数字、字母下划线、汉字组成的

Question

如何验证

Answer 1

<?php
$username = "wang阿";
if(preg_match('/^[0-9a-zA-Z_\x{4e00}-\x{9fa5}]+$/u',$username))
{
echo 'ok';
}
else
{
echo 'error';
}
?>

Answer 2

<?php
$username
=
"wang阿";
if(preg_match('/^[0-9a-zA-Z_\x{4e00}-\x{9fa5}]+$/u',$username))
{
echo
'ok';
}
else
{
echo
'error';
}
?>