Checking browser and version with REGEX

Question

I am working on a Vb.net MVC system and need to detect the browser and version.

I will only use Chrome, and IE9+. I was wondering if I could simplify the verification structure using Regex.

Below the section I use to make the check.

If (Not Request.Browser.ToString().ToLower().Contains("ie") And
        Not Request.Browser.ToString().ToLower().Contains("internet explorer") And
        Not Request.Browser.ToString().ToLower().Contains("chrome")) Then

        Return View("IncompativelAgent")
    Else
        If Not Request.Browser.ToString().ToLower().Contains("chrome") And Request.Browser.MajorVersion < 9 Then
            Return View("IncompativelAgent")
        End If
    End If

I find it very inelegant the way it is.

Answer 1

Following this link to obtain the information :

C#

System.Web.HttpBrowserCapabilities browser = Request.Browser;

string pattern = @"ie|internet explorer|chrome";

MatchCollection matches = Regex.Matches(browser.Browser, pattern, RegexOptions.IgnoreCase)

if(matchs.Count == 0 And browser.Version < 9){
    Return View("IncompativelAgent");
}

VB

    Dim regex As Regex = New Regex("ie|internet explorer|chrome", RegexOptions.IgnoreCase)
    Dim match As Match = regex.Match(Request.Browser.Browser)
    If (Not match.Success Or (match.Success And Request.Browser.MajorVersion < 9)) Then
        Return View("IncompativelAgent")
    End If

Obs

I’m not knowledgeable, build on research.

Links

How to: Detect Browser Types and Browser Capabilities in ASP.NET Web Forms
Check Browser version and name (VB.net)
VB.NET Regex.Match Function Examples