sed 替换有单引号的行

cat test.txt

$config['useragent'] = 'Roundcube Webmail'; // Hide version number
//$config['username_domain'] = 'www.b.com';  #要去掉前面的//
$config['mime_types'] = '/etc/mime.types';

sed -i '///$config.*username_domain/ s&//&&g' test

文件中有这样一句置换对象

http://www.aaa.com/top.jsp?_para1=ture&_para2=false&_para3=ok

希望最后置换成 

http://www.aaa.com/top/?_para1=ture&_para3=ok

sed -i '/http://www.aaa.com/ s#.jsp?_para1=ture&_para2=false&_para3=ok#/?_para1=ture&_para3=ok#' test.txt     #关键& 要转译