regex to redirect non www to www and subdomain to file

I need to do the following .. have come across various examples but i need to combine three conditions

redirect 1) redirect non www / non subdomain requests. eg :

http://xyzsite.com to http://www.xyzsite.com

2) redirect if subdomain is mentioned . eg :

http://user1.xyzsite.com to http://www.xyzsite.com/profile?user1

3) redirect to mobile version. eg :

http://m.xyzsite.com to http://www.xyzsite.com/m

Tech details : I m on IIS ver 6 & using helicontech isapi_rewrite module

1.

• Match: ^xyzsite.com$
• Redirect: www.xyzsite.com

2.

• Match: ^(?!www.)(.*).xyzsite.com$
• Redirect: www.xyzsite.com/profile?$1

3.

• Match: ^m.(.*)$
• Redirect: www.$1/m