Warning: preg_match(): Compilation failed: PCRE does not support

运行一下上面这段代码，看会有什么提示信息？
Warning: preg_match(): Compilation failed: PCRE does not support \L, \l, \N, \P, \p, \U, \u, or \X at offset 3 in D:\www\php\test.php on line 2
原来，PHP正则表达式中不支持下列 Perl 转义序列：\L, \l, \N, \P, \p, \U, \u, or \X
在 UTF-8 模式下，允许用“\x{…}”，花括号中的内容是表示十六进制数字的字符串。
原来的十六进制转义序列 \xhh 如果其值大于 127 的话则匹配了一个双字节 UTF-8 字符。
所以，可以这样来解决

$str = '中国';
//echo preg_match('/^[\u4e00-\u9fa5]{2,12}$/', $real_name);复制代码 代码如下:
<?php
$shouji ="中国人";
if (!preg_match("/^[\x80-\xff]{6,30}$/",$shouji)){
echo "no";
}
else {
echo "yes";
}
?>

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