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What are usable codes to do URL forwarding according to Level 3 domain names?

• 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“http://toy.website.com” and “http://food.website.com” could be forwarded to some predefined URLs. “http://toy.website.com” 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“http://my.toy.website.com” , 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 “http://my.website.com” 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, http://undefined_whose.toy.website.com 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. http://my.undefined_noun.website.com 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 http://undefined_words.website.com , or type in more than level 4 subdomains, or “both undefined level 3 and undefined level 2” ,such as http://undefined_whose.undefined_noun.website.comthey should be redirected uniformly to http://www.myplace.com/domain_rule.html Could we use html5 JavaScript, get domain names from the browser to a string, use “split()” [ “ . ”as seperator， “howmany” to get number of subdomains] , then apply “if else” or “case” ？ Or php code?  Would Apache Mod_Rewrite help??? Anyone could offer a lending hand and post all codes that I am able to use directly? *** Thanks for some answers, but the point is "unlimited keywords". 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.

• Answer:

  I am unable to understand your exact question, but if you want to get the hostname and sub-domain of a webpage using JavaScript, you can use  // if url is http://in.screen.yahoo.com/anushka-goes-va-va-vroom-115000791.html var hostname = document.location.hostname; // hostname is in.screen.yahoo.com var subDomainParts = hostname.split("."); // subDomainParts  is ["in", "screen", "yahoo", "com"]