问C#_Regex_.Oftype<match>()

EN

String source = "Car2Bike6Ship6Bike3Car64Ship56"
var result = Regex
.Matches(source, "(?<name>[A-Z_[ạảàáãăắẳằặẵâấẩầậẫóỏòọõôốổồộỗơớởờợỡéèẻẹẽêếềểệễúùủụũưứừửựữíìỉịĩýỳỷỵỹđ_ẠẢÀÁÃĂẮẲẰẶẴÂẤẨẦẬẪÓỎÒỌÕÔỐỔỒỘỖƠỚỞỜỢỠÉÈẺẸẼÊẾỀỂỆỄÚÙỦỤŨƯỨỪỬỰỮÍÌỈỊĨÝỲỶỴỸĐ_a-z]+)(?<size>[0-9]+)")
.OfType<Match>()
.Select(match => new
{
    name = match.Groups["name"].Value,
    size = int.Parse(match.Groups["size"].Value),
})

.GroupBy(value => value.name)
.Select(chunk => String.Format("{0}: {1}",
   chunk.Key, String.Join(" + ", chunk.Select(item => item.size))));
        String report = String.Join(Environment.NewLine, result);

        report = report.Replace(": 0", ":");
        report = report.Replace(": +", ":");
        Console.Write(report);
        Console.ReadLine();