求一Regex解決辦法

求一Regex
求一Regex替換
baidu
如上字串中標籤外的baidu 為 baidu

------解決方案--------------------

PHP code

$s = 'baid,baidu,baidu,google,baidu  baidu  sdfsdf www.baidu.com ';echo preg_replace("/(?\\1",$s);
------解決方案--------------------
$search  = array("/(.*)([^\.]baidu[^\.])(.*)/", "/(.*)([^\.]baid[^\.])(.*)/", "/(.*)([^\.]google[^\.])(.*)/");
$replace = "\$1 baidu $3";
$str = ' baidu baid  12312 google ';
$res = preg_replace( $search, $replace, $str );
exit($res);

------解決方案--------------------
貌似PHP裡有反向預查,那樣的話,很簡單的就可以解決了...:D
飄走... 
