Steps for obtaining an apacherewrite unlimited second-level domain name

Evaluate the apacherewrite unlimited second-level domain name method RewriteCond % {HTTP_HOST} ^ [a-z0-9 \-] + \. xxx \. net $ RewriteRule ^ /? $/% {HTTP_HOST} RewriteRule ^/([a-z method for obtaining the apache rewrite unlimited second-level domain name)
RewriteCond % {HTTP_HOST} ^ [a-z0-9 \-] + \. xxx \. net $
RewriteRule ^ /? $/% {HTTP_HOST}
RewriteRule ^/[a-z0-9 \-] +) \. xxx \. net /? $/Index. php? App = $1

This is the second-level domain name that can be found online. that is, when bbb.xxx.net is entered in the address bar, what is actually executed is www.xxx.net/index.php? App = bbb

But when the URL is bbb.xxx.net/index.php? Ac = 111 & a = 222 & B = 333 how can I change a rewrite rule to www.xxx.net/index.php? App = bbb & ac = 111 & a = 222 & B = 333

Specific rules

------ Solution --------------------
RewriteRule ^/[a-z0-9 \-] +) \. xxx \. net/index \. php \? (.*?) $/Index. php? App = $1 & $2