只允许汉字，字母，数字和停横线组合的正则

只允许汉字，字母，数字和下横线组合的正则

PHP code

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    if(isset($_GET["username"])){
    $username=$_GET["username"];
    $str=mb_strlen($username);
    if(!preg_match("/^[".chr(0xa1)."-".chr(0xff)." | a-z | 0-9 | A-Z| \_]+$/",$username) || $str16) 
    { 
    echo "1"; 
    }
    }

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PHP code

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if(isset($_GET["username"])){
    $username=$_GET["username"];
    $str=mb_strlen($username);
    if(!preg_match("/(([\xB0-\xF7][\xA1-\xFE])|([\x81-\xA0][\x40-\xFE])|([\xAA-\xFE][\x40-\xA0])|(\w))+/",$username) || $str16) 
    { 
    echo "1"; 
    } 
    }

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PHP code

$s ='我是ss中_文';
$p='/^[\x{4e00}-\x{9fa5}\w]+$/u'; 
$bool=preg_match($p,$s);
var_dump($bool);   // 1
<br><font color="#e78608">------解决方案--------------------</font><br>
你这是 gbk 编码的<br>if(preg_match('/^(?:\w|[\x80-\x9f\xb0-\xff].)+$/', $s))<br><br>对于 utf-8 编码要简单些<br>if(preg_match('^\w+$/u'))<br> <div class="clear">
                 
              
              
        
            </div>

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