ABPCMS.Web/Views/UrlChecker.cs

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using System.Text.RegularExpressions;

namespace ABPCMS.Web.Views
{
    public static class UrlChecker
    {
        private static readonly Regex UrlWithProtocolRegex = new Regex("^.{1,10}://.*$");

        public static bool IsRooted(string url)
        {
            if (url.StartsWith("/"))
            {
                return true;
            }
            
            if (UrlWithProtocolRegex.IsMatch(url))
            {
                return true;
            }

            return false;
        }
    }
}