BB Code In asp.net

I am looking for a regular expression to build URL BB Code which would extract  the


Learn more about [url=http://www.asp.net/]ASP" target="_blank" title=" tags and convert that into a hyper link for example if string is like this


Learn more about [url=http://www.asp.net/]ASP"> tags and convert that into a hyper link for example if string is like this


Learn more about [url=http://www.asp.net/]ASP 
it should convert it into like 
Learn more about <a href="http://www.asp.net/">ASP</a>
and if the string is like "Learn more about http:/www.ASP.Net" should convert it to like 
Learn more about <a href="http://www.asp.net/">http://www.asp.net</a>
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