treating different versions of website urls as one

hi
I am trying out a web app where it needs to process user given website
addresses .My problem is that ,I need to treat
http://mysite.com ,
www.mysite.com,
mysite.com,
www.mysite.com/index.html,
www.mysite.com/index.php ...etc as the same and not different urls.How
can I do the validation in this case?Do I have to manually do the
string parsing and validate?
Any suggestions most welcome
thanks
harry

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