自定義ubb代碼,preg_replace()函數的一些代碼

function?ubb($Text)?{
$Text=htmlspecialchars($Text);
$Text=ereg_replace(“rn”,”<br>”,$Text);
$Text=ereg_replace(“r”,”<br>”,$Text);
$Text=nl2br($Text);
$Text=preg_replace(“/\t/is”,”??“,$Text);
$Text=preg_replace(“/[h1](.+?)[/h1]/is”,”<h1>\1</h1>”,$Text);
$Text=preg_replace(“/[h2](.+?)[/h2]/is”,”<h2>\1</h2>”,$Text);
$Text=preg_replace(“/[h3](.+?)[/h3]/is”,”<h3>\1</h3>”,$Text);
$Text=preg_replace(“/[h4](.+?)[/h4]/is”,”<h4>\1</h4>”,$Text);
$Text=preg_replace(“/[h5](.+?)[/h5]/is”,”<h5>\1</h5>”,$Text);
$Text=preg_replace(“/[h6](.+?)[/h6]/is”,”<h6>\1</h6>”,$Text);

$Text=preg_replace(“/[url](http://.+?)[/url]/is”,”<a?href=\1>\1</a>”,$Text);
$Text=preg_replace(“/[url](.+?)[/url]/is”,”<a?href=”http://\1″>http://\1</a>”,$Text);
$Text=preg_replace(“/[url=(http://.+?)](.*)[/url]/is”,”<a?href=\1>\2</a>”,$Text);
$Text=preg_replace(“/[url=(.+?)](.*)[/url]/is”,”<a?href=http://\1>\2</a>”,$Text);

$Text=preg_replace(“/[img](.+?)[/img]/is”,”<img?src=\1>”,$Text);
$Text=preg_replace(“/[color=(.+?)](.+?)[/color]/is”,”<font?color=\1>\2</font>”,$Text);
$Text=preg_replace(“/[size=(.+?)](.+?)[/size]/is”,”<font?size=\1>\2</font>”,$Text);
$Text=preg_replace(“/[sup](.+?)[/sup]/is”,”^\1”,$Text);
$Text=preg_replace(“/[sub](.+?)[/sub]/is”,”_\1”,$Text);
$Text=preg_replace(“/[pre](.+?)[/pre]/is”,”<pre>\1</pre>”,$Text);
$Text=preg_replace(“/[email](.+?)[/email]/is”,”<a?href=\1>\1</a>”,$Text);
$Text=preg_replace(“/[i](.+?)[/i]/is”,”<i>\1</i>”,$Text);
$Text=preg_replace(“/[b](.+?)[/b]/is”,”<b>\1</b>”,$Text);
$Text=preg_replace(“/[quote](.+?)[/quote]/is”,”<blockquote><font?size=’2′?face=’Courier?New’>quote:</font><hr>\1<hr></blockquote>”,?$Text);
$Text=preg_replace(“/[code](.+?)[/code]/is”,”<blockquote><font?size=’2′?face=’Courier?New’>code:</font><hr?color=’lightblue’><i>\1</i><hr?color=’lightblue’></blockquote>”,?$Text);
$Text=preg_replace(“/[sig](.+?)[/sig]/is”,”<div?style=’text-align:?left;?color:?darkgreen;?margin-left:?5%’><br><br>————————–<br>\1<br>————————–</div>”,?$Text);
return?$Text;
}
function?str($msg){
global?$admin;
if(!$admin[html])?$msg=htmlspecialchars($msg);
if($admin[ubb])?$msg=ubb($msg);
$msg=nl2br($msg);?#處理message
$msg=?str_replace(“n”,””,$msg);?#處理message
$msg=?str_replace(“r”,””,$msg);?#處理message
return?$msg;
}
function?error($msg){
global?$admin;
?>

中的
$Text=preg_replace(“/[h2](.+?)[/h2]/is”,”<h2>\1</h2>”,$Text);

里面的?(“/[h2](.+?)[/h2]/is”,”<h2>\1</h2>”,$text)

/[h2](.+?)[/h2]/is??轉化成?<h2>\1</h2>

/[h2](.+?)[/h2]/is??里面的?這些”/(.+?)?“之類的符號是怎么看的?是什么意思?
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是轉意，本身是特殊符號，如果要作為普通字符就要用來轉意，就是說\表示()也是特殊符號，所以要用轉意