At work, we use VB.net and one problem that I encountered involved a forum where they wanted to automatically link any words with http:// or https:// within the posts. Aside from security concerns, you can do this using the following script.
However, it is important to note, that it will only link URLS that are one word. You could modify the regular expression so that if a person put quotes around the URL, they could link the entire thing, but I am going to leave that to someone else.
' Function: LinkText() ' Takes a msg and automatically adds HTML to link all words starting ' http:// or https:// in the text ' Parameters ' Msg: Is the Message we want to link the links in ' Returns: ' NewMsg: The linked the links in the text Function LinkText(ByVal Msg As String) ' Remove all hrefs (so we can replace them) Msg = Msg.Replace("", "") Msg = System.Text.RegularExpressions.Regex.Replace(Msg, "]*>?","") Dim MatchObj as MatchCollection = Regex.Matches(Msg, "(htt(p|ps)://.+?)($|\s+)") Dim NewMsg As String = Msg For Each m As Match In MatchObj NewMsg = System.Text.RegularExpressions.Regex.Replace(NewMsg, m.Groups(0).Value, "<a href=""" & m.Groups(1).Value & """>" & m.Groups(1).Value & "</a>" & m.Groups(3).Value) Next Return NewMsg End Function