一个ubbcode的函数，速度很快.

领测软件测试网 前面见到有人发表
但是速度比较慢，也非常长
这里给出一种

function ubb($str) {  
$color=Array(@#red@#,@#blue@#,@#green@#);
$str=eregi_replace(@#\[url\]([a-zA-Z0-9@:%_.~#-\?&]+)\[\/url\]@#,@#<a href=http://\\1>\\1</a>@#,$str);//url
$str=eregi_replace(@#\[url=http://([a-zA-Z0-9@:%_.~#-\?&]+)\](.+)\[\/url\]@#,@#<a href=\\1 target=_blank>\\2</a>@#,$str);
$str=eregi_replace(@#\[url=([a-zA-Z0-9@:%_.~#-\?&]+)\](.+)\[\/url\]@#,@#<a href=http://\\1 target=_blank>\\2</a>@#,$str);
$str=eregi_replace(@#\[img\]([a-zA-Z0-9@:%_.~#-\?&]+)\[\/img\]@#,@#<img src=http://\\1>\\1</img>@#,$str);//img
$str=eregi_replace(@#\[h([1-6])\](.+)\[\/h[1-6]\]@#,@#<h\\1>\\2</h\\1>@#,$str);//h1-6
$str=eregi_replace(@#\[email\]([_\.0-9a-z-]+@([0-9a-z][0-9a-z-]+\.)+[a-z]{2,3})\[\/email\]@#,@#<a href=mailto:\\1>\\1</a>@#,$str);//email
$str=eregi_replace(@#\[email=([_\.0-9a-z-]+@([0-9a-z][0-9a-z-]+\.)+[a-z]{2,3})\](.+)\[\/email\]@#,@#<a href=mailto:\\1>\\2</a>@#,$str);
$str=eregi_replace(@#\[b\](.+)\[\/b\]@#,@#<b>\\1</b>@#,$str);
$str=eregi_replace(@#\[i\](.+)\[\/i\]@#,@#<i>\\1</i>@#,$str);
$str=eregi_replace(@#\[size=(.+)\](.+)\[\/size\]@#,@#<font size=\\1>\\2</font>@#,$str);
$str=eregi_replace(@#\[color=(.+)\](.+)\[\/color\]@#,@#<font color=\\1>\\2</font>@#,$str);
$str=eregi_replace(@#\[sub\](.+)\[\/sub\]@#,@#<sub>\\1</sup>@#,$str);//下裱
$str=eregi_replace(@#\[sup\](.+)\[\/sup\]@#,@#^\\1@#,$str);//上标
for($i=0;$i<=count($color);$i++)$str=eregi_replace(@#\[@#.$color[$i].@#\](.+)\[\/@#.$color[$i].@#\]@#,@#<font color=@#.$color[$i].@#>\\1</font>@#,$str);
$str=preg_replace("/\[quote\](.+?)\[\/quote\]/is","<blockquote><font size=@#1@# face=@#Courier New@#>quote:</font><hr>\\1<hr></blockquote>", $str);
$str=preg_replace("/\[code\](.+?)\[\/code\]/is","<blockquote><font size=@#1@# face=@#Times New Roman@#>code:</font><hr color=@#lightblue@#><i>\\1</i><hr color=@#lightblue@#></blockquote>", $str);
$str=preg_replace("/\[sig\](.+?)\[\/sig\]/is","<div style=@#text-align: left;color: darkgreen;margin-left: 5%@#><br><br>--------------------------<br>\\1<br>--------------------------</div>", $str);
return $str;
} 

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