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php 正则判断中文(自动识别UTF-8 & GBK编码)

WBOY
Release: 2016-05-25 16:45:58
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下面这款实例程序是一款PHP 正确匹配UTF8或gbk中文的正则表达式程序,能准确的获取不同编码情况的中文汉字的识别.

PHP实例代码如下:

<?php
$action = trim($_get[&#39;action&#39;]);  
if($action == "sub")  
{  
    $str = $_post[&#39;dir&#39;];     
    //if(!preg_match("/^[".chr(0xa1)."-".chr(0xff)."a-za-z0-9_]+$/",$str)) //gb2312汉字字母数字下划线正则表达式  
    if(!preg_match("/^[x{4e00}-x{9fa5}a-za-z0-9_]+$/u",$str))   //utf-8汉字字母数字下划线正则表达式  
    {    
        echo "<font color=red>您输入的[".$str."]含有违法字符</font>";    
    }  
    else  
    {  
        echo "<font color=green>您输入的[".$str."]完全合法,通过!</font>";    
    }  
}  
?>
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<form method="post" action="">  
输入字符(数字,字母,汉字,下划线):  
    <input type="text" name="dir" value="">  
    <input type="submit" value="提交">  
</form>
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gbk:代码如下

preg_match("/^[".chr(0xa1)."-".chr(0xff)."a-za-z0-9_]+$/",$str); //gb2312汉字字母数字下划线正则表达式.
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