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var str = "php±à³Ì";
if (/^[\u4e00-\u9fa5]+$/.test(str)) {
alert("¸Ã×Ö·û´®È«²¿ÊÇÖÐÎÄ");
}
else{
alert("¸Ã×Ö·û´®²»È«²¿ÊÇÖÐÎÄ");
} phpÖУ¬ÊÇÓÃ\x±íʾʮÁù½øÖÆÊý¾ÝµÄ¡£ÓÚÊÇ£¬±ä»»³ÉÈçϵĴúÂ룺
$str = "php±à³Ì";
if (preg_match("/^[\x4e00-\x9fa5]+$/",$str)) {
print("¸Ã×Ö·û´®È«²¿ÊÇÖÐÎÄ");
} else {
print("¸Ã×Ö·û´®²»È«²¿ÊÇÖÐÎÄ");
}
òËƲ»±¨´íÁË£¬ÅжϵĽá¹ûÒ²ÕýÈ·£¬²»¹ý°Ñ$str»»³É“±à³Ì”Á½×Ö£¬½á¹ûÈ´»¹ÊÇÏÔʾ“¸Ã×Ö·û´®²»È«²¿ÊÇÖÐÎÄ”£¬¿´À´ÕâÑùµÄÅжϻ¹ÊDz»¹»×¼È·¡£ÖØÒª:²éÔÄÁË<¾«Í¨ÕýÔò±í´ïʽ>·¢ÏÖ,¶ÔÓÚ[\x4e00-\x9fa5]Õâ¿é¶«Î÷,×Ô¼º×öÒ»¸öÇ¿»¯µÄ½âÊÍ phpµÄÕýÔòÖÐ, [\x4e00-\x9fa5],Æäʵ¾ÍÊÇ ×Ö·ûºÍ×Ö·û×éµÄ¸ÅÄî, \x{hex},±í´ïÒ»¸ö16½øÖÆÊý, ÐèҪעÒâµÄÊÇhex ¿ÉÒÔÊÇ1-2λµÄ,Ò²¿ÉÒÔÊÇ4λµÄ,µ«ÊÇÈç¹ûÊÇ4λµÄ±ØÐë¼ÓÉÏ´óÀ¨ºÅ, ͬʱ,Èç¹ûÊÇ´óÓÚx{FF}µÄhex,±ØÐëºÍu ÐÞÊηûÁ¬ÓÃ,²»È»»á·Ç·¨³ö´í
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[\u4e00-\u9fa5]¿ÉÒÔÆ¥ÅäÖÐÎÄ,µ«ÊÇPHPÓÖ²»Ö§³Ö  
²»¹ý£¬¼ÈÈ»\x±íʾµÄÊ®Áù½øÖÆÊý¾Ý£¬ÎªÊ²Ã´ºÍjsÀï±ßÌṩµÄ·¶Î§\x4e00-\x9fa5²»Ò»ÑùÄØ£¿ÓÚÊÇÎҾͻ»³ÉÁËϱߵĴúÂë,·¢ÏÖÕæµÄ׼ȷÁË£º
$str = "php±à³Ì";
if (preg_match("/^[\x{4e00}-\x{9fa5}]+$/u",$str)) {
print("¸Ã×Ö·û´®È«²¿ÊÇÖÐÎÄ");
} else {
print("¸Ã×Ö·û´®²»È«²¿ÊÇÖÐÎÄ");
} ÖªµÀÁËphpÖÐutf-8±àÂëÏÂÓÃÕýÔò±í´ïʽƥÅ人×ÖµÄ×îÖÕÕýÈ·±í´ïʽ——/^[\x{4e00}-\x{9fa5}]+$/u£¬
²Î¿¼ÒÔÉÏÎÄÕÂдÁËÈçÏÂÒ»¶Î²âÊÔ´úÂë(¸´ÖÆÒÔÏ´úÂë±£´æ³É.phpÎļþ) <?php
$action = trim($_GET['action']);
if($action == "sub")
{
    $str = $_POST['dir'];  
    //if(!preg_match("/^[".chr(0xa1)."-".chr(0xff)."A-Za-z0-9_]+$/",$str)) //GB2312ºº×Ö×ÖĸÊý×ÖÏ»®ÏßÕýÔò±í´ïʽ
    if(!preg_match("/^[\x{4e00}-\x{9fa5}A-Za-z0-9_]+$/u",$str))   //UTF-8ºº×Ö×ÖĸÊý×ÖÏ»®ÏßÕýÔò±í´ïʽ
    { 
        echo "<font color=red>ÄúÊäÈëµÄ[".$str."]º¬ÓÐÎ¥·¨×Ö·û</font>"; 
    }
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