正则高手请进

发布文章提交前向文中查找名字并加链接，用以下格式老出错，帮帮小弟
$data['i_title']="标题";
$data['i_content']="内容";
$base='/1164';
$s_name="名字";
$url=preg_replace("/(\/)/m","\\\$1",$base);print_r($url);
$pattern = "/("+$s_name+"+)/im";
$replacement = "<a href=\"$url\">${1}</a>";
$str="信息来自："+getConfig('s_name')+" "+$data['i_title']+"<br>"+$data['i_content'];
//print_r(preg_replace($pattern,$replacement,$str));