RegEx and ASP.NET

[ShawnMolloy]

I'm trying to create a reg ex expression for a URL rewriting .net handler that will find user names that precede a web url and redirect them based off their ID to a certain page. Example:

http://MySite.com/SomeUser

The regex expression should look for a string that doesn't have an extension I guess. Here is the code that parses the regex:

public string GetSubstitution(string zPath) 
{
    Regex oReg;

    foreach(XmlNode oNode in _oRules.SelectNodes("rule")) {
        oReg=new Regex(oNode.SelectSingleNode("url/text()").Value);
        Match oMatch=oReg.Match(zPath);

        if(oMatch.Success) {
            return oReg.Replace(zPath,
                             oNode.SelectSingleNode("rewrite/text()").Value);
        }
    }

    return zPath;
}

Can you help write this expression?

Thanks!

Shawn Molloy
Seattle, WA