URLs to subdomains via .htaccess

What would be a good way of rewriting these types of urls (via a wildcard subdomain):

http://somedomain.com/263-NYC-Manhattan to http://nycmanhattan.somedomain.com
or
http://somedomain.com/116-Chicago to http://chicago.somedomain.com
or
http://somedomain.com/365-Houston to http://huston.somedomain.com

etc. etc. etc.

Basically, it needs to omit the numbers and dashes.

 

I found 2 solutions that might work however I don't think they're stripping the numbers and dashes. Any ideas what needs to be adjusted?

RewriteEngine On
RewriteCond %{HTTP_HOST} !^www\.mywebsite\.com$
RewriteCond %{HTTP_HOST} ^(\w+)\.mywebsite\.com$
RewriteCond %{DOCUMENT_ROOT}/%1%{REQUEST_URI} -f [OR]
RewriteCond %{DOCUMENT_ROOT}/%1%{REQUEST_URI} -d
RewriteRule ^(.*)$ /%1/$1 [QSA]

Or:

RewriteEngine On
RewriteCond %{HTTP_HOST} !^www\.mywebsite\.com$
RewriteCond %{HTTP_HOST} ^(\w+)\.mywebsite\.com$
RewriteCond %{REQUEST_URI}:%1 !^/([^/]+)/([^:]*):\1
RewriteRule ^(.*)$ /%1/$1 [QSA]

Code (markup):

 

Not sure, but depending on the amount of URL's you need to redirect you might be better off just by using a standard Redirect than going through all the trouble that wildcard can be
e.g
Redirect 301 /263-NYC-Manhattan http://nycmanhattan.somedomain.com
Redirect 301 /116-Chicago http://chicago.somedomain.com
Redirect 301 /365-Houston http://huston.somedomain.com
Let me know if that's any help

 

I abandoned the entire wildcard idea. If one has 5-10 wildcard re-directs it's all fine. But when you have to deal with something like 700 of them it's a completely different story as it will eat up all your resources and available user connections. But I agree, what you're suggesting is a better way to go about it.