ASP.NET / VB / REGEX: Automatically create links beginning with www at beginning

I use the following code to make links clickable where the link begins with www.

input = RegularExpressions.Regex.Replace(input, "(\www\.\S+[^\s@,.""']+)", "<a href=""http://$1"">$1</a>")

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The problem is that this becomes clickable links:
zwww.example.com
/www.example.com
>www.example.com

It should ONLY become a clickable link if it starts with www and does not have another charactor (other than whitespace)
LVL 16
hankknightAsked:
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Terry WoodsConnect With a Mentor IT GuruCommented:
Try this:
input = RegularExpressions.Regex.Replace(input, "(?<!\S)(\www\.\S+[^\s@,.""']+)", "<a href=""http://$1"">$1</a>")

By the way, the first w in www is backslashed in your pattern, which means it's matching any word character rather than just a literal w. It should probably be:
input = RegularExpressions.Regex.Replace(input, "(?<!\S)(www\.\S+[^\s@,.""']+)", "<a href=""http://$1"">$1</a>")
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