php判断是否为中文正则表达式大全(转)
转载自?? http://www.cnblogs.com/DavidYan/articles/2032115.html
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php判断是否为中文正则表达式大全
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<?php
$str="aaa";
if(!eregi("[^\x80-\xff]","$str"))
{
echo "是";
}
else
{
echo "不是";
}
?>
<?
$str = "中国";
echo $str;
echo "<hr>";
//if (preg_match("/^[".chr(0xa1)."-".chr(0xff)."]+$/", $str)) {//只能在GB2312情况下使用
if (preg_match("/^[\x7f-\xff]+$/", $str)) { //兼容gb2312,utf-8
echo "正确输入";
} else {
echo "错误输入";
}
?>
如果想判断一个字符串内是否有含有中文，请用下面的代码：
if (preg_match("/[\x7f-\xff]/", $string)) {
echo "有中文";
}else{
echo "没有中文";
}
判断中文和编码有关gbk是双字节，utf8是三字节，可以根据中文的范围来判断???
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编码范围1. GBK(GB2312/GB18030)???
\x00-\xffGBK双字节编码范围???
\x20-\x7fASCII???
\xa1-\xff中文???
\x80-\xff 中文??
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2. UTF-8(Unicode)???
\u4e00-\u9fa5(中文)???
\x3130-\x318F(韩文???
\xAC00-\xD7A3(韩文)???
\u0800-\u4e00(日文)???
ps:韩文是大于[\u9fa5]的字符???
正则例子:???
preg_replace(”/([\x80-\xff])/”,”",$str);??
preg_replace(”/([u4e00-u9fa5])/”,”",$str);???
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- //判断内容里有没有中文-GBK?(PHP)???????function?check_is_chinese($s){????????????return?preg_match('/[\x80-\xff]./',?$s);???????}????????????//获取字符串长度-GBK?(PHP)???????function?gb_strlen($str){????????????$count?=?0;????????????for($i=0;?$i<strlen($str);?$i++){????????????????$s?=?substr($str,?$i,?1);????????????????if?(preg_match("/[\x80-\xff]/",?$s))?++$i;??????????????????++$count;????????????}????????????return?$count;???????}????????????//截取字符串字串-GBK?(PHP)???????function?gb_substr($str,?$len){????????????$count?=?0;????????????for($i=0;?$i<strlen($str);?$i++){????????????????if($count?==?$len)?break;????????????????if(preg_match("/[\x80-\xff]/",?substr($str,?$i,?1)))?++$i;??????????????????++$count;????????????????????}????????????return?substr($str,?0,?$i);???????}????????????//统计字符串长度-UTF8?(PHP)???????function?utf8_strlen($str)?{????????????$count?=?0;????????????for($i?=?0;?$i?<?strlen($str);?$i++){????????????????$value?=?ord($str[$i]);????????????????if($value?>?127)?{????????????????????$count++;????????????????????if($value?>=?192?&&?$value?<=?223)?$i++;????????????????????elseif($value?>=?224?&&?$value?<=?239)?$i?=?$i?+?2;????????????????????elseif($value?>=?240?&&?$value?<=?247)?$i?=?$i?+?3;????????????????????else?die('Not?a?UTF-8?compatible?string');????????????????}????????????????$count++;????????????}????????????return?$count;???????}?????????????????//截取字符串-UTF8(PHP)???????function?utf8_substr($str,$position,$length){????????????$start_position?=?strlen($str);????????????$start_byte?=?0;????????????$end_position?=?strlen($str);????????????$count?=?0;????????????for($i?=?0;?$i?<?strlen($str);?$i++){????????????????if($count?>=?$position?&&?$start_position?>?$i){????????????????????$start_position?=?$i;????????????????????$start_byte?=?$count;????????????????}????????????????if(($count-$start_byte)>=$length)?{????????????????????$end_position?=?$i;????????????????????break;????????????????}????????????????????$value?=?ord($str[$i]);????????????????if($value?>?127){????????????????????$count++;????????????????????if($value?>=?192?&&?$value?<=?223)?$i++;????????????????????elseif($value?>=?224?&&?$value?<=?239)?$i?=?$i?+?2;????????????????????elseif($value?>=?240?&&?$value?<=?247)?$i?=?$i?+?3;????????????????????else?die('Not?a?UTF-8?compatible?string');????????????????}????????????????$count++;?????????????????}????????????return(substr($str,$start_position,$end_position-$start_position));???????}????????????//判断是否是有韩文-UTF-8?(JavaScript)???????function?checkKoreaChar(str)?{????????????for(i=0;?i<str.length;?i++)?{????????????????if(((str.charCodeAt(i)?>?0x3130?&&?str.charCodeAt(i)?<?0x318F)?||?(str.charCodeAt(i)?>=?0xAC00?&&?str.charCodeAt(i)?<=?0xD7A3)))?{????????????????????return?true;????????????????}????????????}????????????return?false;???????}????????????//判断是否有中文字符-GBK?(JavaScript)???????function?check_chinese_char(s){????????????return?(s.length?!=?s.replace(/[^\x00-\xff]/g,"**").length);???????}???
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UTF-8匹配:
在javascript中，要判断字符串是中文是很简单的。比如：
var str = "php编程";
if (/^[\u4e00-\u9fa5]+$/.test(str)) {
alert("该字符串全部是中文");
}
else{
alert("该字符串不全部是中文");
}
php中，是用\x表示十六进制数据的。于是，变换成如下的代码：
$str = "php编程";
if (preg_match("/^[\x4e00-\x9fa5]+$/",$str)) {
print("该字符串全部是中文");
} else {
print("该字符串不全部是中文");
}
貌似不报错了，判断的结果也正确，不过把$str换成“编程”两字，结果却还是显示“该字符串不全部是中文”，看来这样的判断还是不够准确。
重要:查阅了<精通正则表达式>发现,对于[\x4e00-\x9fa5]这块东西,自己做一个强化的解释
php的正则中, [\x4e00-\x9fa5],其实就是 字符和字符组的概念, \x{hex},表达一个16进制数,需要注意的是hex 可以是1-2位的,也可以是4位的,但是如果是4位的必须加上大括号,
同时,如果是大于x{FF}的hex,必须和u 修饰符连用,不然会非法出错
网上只能找到匹配全角字符的正则:??^[\x80-\xff]*^/???,这里可以不加大括号
[\u4e00-\u9fa5]可以匹配中文,但是PHP又不支持???
不过，既然\x表示的十六进制数据，为什么和js里边提供的范围\x4e00-\x9fa5不一样呢？于是我就换成了下边的代码,发现真的准确了：
$str = "php编程";
if (preg_match("/^[\x{4e00}-\x{9fa5}]+$/u",$str)) {
print("该字符串全部是中文");
} else {
print("该字符串不全部是中文");
}
知道了php中utf-8编码下用正则表达式匹配汉字的最终正确表达式——/^[\x{4e00}-\x{9fa5}]+$/u，
参考以上文章写了如下一段测试代码(复制以下代码保存成.php文件)
<?php
$action = trim($_GET['action']);
if($action == "sub")
{
??? $str =$_POST['dir'];???
???//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 "<fontcolor=red>您输入的[".$str."]含有违法字符</font>";??
??? }
??? else
??? {
???????echo "<fontcolor=green>您输入的[".$str."]完全合法,通过!</font>";??
??? }
}
?>
<form method="POST"action="?action=sub">
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>
GBK:
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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<?php
$str="aaa";
if(!eregi("[^\x80-\xff]","$str"))
{
echo "是";
}
else
{
echo "不是";
}
?>
<?
$str = "中国";
echo $str;
echo "<hr>";
//if (preg_match("/^[".chr(0xa1)."-".chr(0xff)."]+$/", $str)) {//只能在GB2312情况下使用
if (preg_match("/^[\x7f-\xff]+$/", $str)) { //兼容gb2312,utf-8
echo "正确输入";
} else {
echo "错误输入";
}
?>
如果想判断一个字符串内是否有含有中文，请用下面的代码：
if (preg_match("/[\x7f-\xff]/", $string)) {
echo "有中文";
}else{
echo "没有中文";
}
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