Regex in vb.net 2.0

Hi all,

Consider the below code:

Dim str as string="Microsoft Corporation (MS) is the biggest company"

Dim strsym as string="MS"

str=Regex.Replace(str,"\((" & strsym & "))\","($1: about $1)")

Response.write(str)

This code will produce the output as : Microsoft Corporation (MS: about MS) is the biggest company

Suppose if i change my string like this :

Dim str as string="Microsoft Corporation (MS,MT) is the biggest company"

Dim strsym as string="MS,MT"

I want the output to be shown as Microsoft Corporation (MS: about MS,MT: about MT) is the biggest company

How can i change the regex to get this kind of output? If any one who know how to do this please send me the code...