problem in creating url rewriting rule

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ASP.NET

i am implementing url rewriting

i have plenty of pages such as

http://www.xyz.com/company1/company_profile.htm
http://www.xyz.com/company2/company_profile.htm
http://www.xyz.com/company3/company_profile.htm
http://www.xyz.com/company4/company_profile.htm
http://www.xyz.com/company5/company_profile.htm

for all those i have created 1 aspx page

and now i want to define rule with regular expression
please help me for creatie a rule for above pattern

<modulesSection>
<rewriteModule>
<rewriteOn>true</rewriteOn>
<rewriteRules>

<rule source="Default.html" destination="Default.aspx"/>

</rewriteRules>
</rewriteModule>
</modulesSection>