String Function that search for URL's in a VARCHAR(nText) Column.

I have the following situation:

I have a column in a table with the DataType VarChar(nText), in that column users enter

a URL like i.e. http://www.mycomanyname.com or any other URL of course.

The thing is that in a lot of cases before and after the URL's text has been entered.

I have now been asked to migrate all URL's for that specific column to migrate it to a different

column that will only store the URL's. I was wondering whether this could be accomplished

using T-SQL or using string functions from within Visual Basic.

Does anybody here has any suggestions or possible solutions on how to get this accomplished?

Many thanks...