Lowercase regex url

Question

Can someone write a regex that can match only lowercase urls that can have a-z letters, 0-9 numbers and -, http:// (https is not required), www. and doesn't have default.aspx?

This is a url that regex must match:
http://www.somedomain.net/news/148/some-text-to-act-as-news-title.aspx

or

http://subdomain.somedomain.net/news/148/some-text-to-act-as-news-title.aspx (withour www.)

Regex must not match any url that have uppercase letters and default.aspx

I did some basic regex that match some of the urls.

Thank you.

EDITED

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This is my attempt: [a-z0-9]{1,}-*

Only matches single words, words with - and numbers

EDITED AGAIN

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Thanks guys to all of you.

Answer 1

^http://((?!default\.aspx)[a-z0-9\-\./])*$

Answer 2

you should exclude the urls that have Uppercase and default.aspx with your native lang. but if you want everything BUT the caps do this.

[a-z/- 0-9]*

Answer 3

^http://[a-z0-9.-]+\.[a-z0-9]+(/(?!.*default\.aspx)[a-z0-9./-]+)?$

Answer 4

A solution with look-ahead assertion:

^http://[a-z0-9-.]+(?:(?!/default\.aspx)/[a-z0-9-.]+)*$