I need to pre-define almost unlimited number of keywords for Level 3 and Level 2 subdomains, in order to forward those pre-defined user-friendly, recognizable domain names to my primary site.
I need to preset: type-in keyword subdomains = parts of the forwarded URLs
For example:
subdomain name “toy” = “noun-1” part of the forwarded URLs  
subdomain name ”food”= “noun-2” part of the forwarded URLs  
number of pre defined noun should be unlimited  
any undefined noun = “noun-0”
subdomain name “my” = “whose-1” part of the forwarded URLs
subdomain name “your” = “whose-2”part of the forwarded URLs
subdomain name “his” = “whose-3”part of the forwarded URLs
number of pre defined possessive pronoun should be unlimited
any undefined possessive pronoun = “whose-0”
So that domain names such as“[url]http://toy.website.com”[/url] and “[url]http://food.website.com”[/url] could be forwarded to some predefined URLs.
“[url]http://toy.website.com”[/url] could be forwarded to http://www.myplace.com/noun-1-whose-0 (“noun-1”first, then ”whose-0”)
http://food.website.com could be forwarded to http://www.myplace.com/noun-2-whose-0
If we type in“[url]http://my.toy.website.com”[/url] , it could be forwarded to http://www.myplace.com/noun-1-whose-1
and http://your.food.website.com needs to redirect to http://www.myplace.com/noun-2-whose-2
“[url]http://my.website.com”[/url] to http://www.myplace.com/noun-0-whose-1
http://your.website.com to http://www.myplace.com/noun-0-whose-2 (“noun-0”should be in place)
If we type in some undefined words, for example, [url]http://undefined_whose.toy.website.com[/url] should be forwarded to http://toy.website.com [just drop undefined words], then forward again to http://www.myplace.com/noun-1-whose-0 accordingly.
[url]http://my.undefined_noun.website.com[/url] first to http://my.website.com then to http://www.myplace.com/noun-0-whose-1
If we only type-in level 2 subdomains without level 3 subdomains, such as [url]http://undefined_words.website.com[/url] , or type in more than level 4 subdomains, or “both undefined level 3 and undefined level 2” ,such as [url]http://undefined_whose.undefined_noun.website.comthey[/url] should be redirected uniformly to http://www.myplace.com/domain_rule.html
Would Apache Mod_Rewrite help???
Anyone could offer a lending hand and post all codes that I am able to use directly?
*** If I set records on a DNS provider, it's fine if the keywords are limited in numbers. But when we consider scaling-up keywords, manually set "Johns.toy", "Marys.toy", "Janes.toy"...and "Janes.food", "Janes.bag", "Janes.book"...."Leos.light"...would be unrealistic.