Regular Expression Capture groups

[Plater]

I'm having no end of trouble getting a correct regular expression for what I am doing. It probably would have taken me 5mins to produce a plain text matching system with string indexes, but even after an hour of failing, I still want to use regex.

I have something like the following as input text

#define  HIT_VAL1       4               //  some comment
#define  HIT_VAL2       5               //  some comment
#define  HIT_VAL3       6               //  some comment
 

And I am looking to pull 2 pieces of information from each line.
So for the following line, I want the bold parts
#define HIT_VAL1 4 // some comment
_______________^ not bold


I have tried various variations on this for just the first bold section:
Regex rx = new Regex(@"^#define HIT_(\w)*", RegexOptions.IgnoreCase);
or
Regex rx = new Regex(@"^(?:#define HIT_)(\w)*", RegexOptions.IgnoreCase);

But all I ever get is:
#define HIT_VAL1
#define HIT_VAL2
#define HIT_VAL3

(?: ) said it should be a NON capture group, I want to ignore that part. I could just pop it off with a string.replace() but I still feel regular expressions should be useful for SOMETHING.
Does anyone have any thoughts? I keep going through regex tutorials, but apparently regex was designed to only do a single match? That seems very poorly thought out?

[Plater]

I think I figured it out. Was a problem with how I looked at the matches vs groups.
Assuming my input string is WholeData, the following worked:

Regex rx = new Regex(@"^#define[\s|\t]+(?<preType>\w*)_(?<name>\w*)[\s|\t]+(?<value>\w*)[\s|\t]+//[\s|\t]*(?<comment>.*)", RegexOptions.IgnoreCase | RegexOptions.Multiline);
MatchCollection matches = rx.Matches(WholeData);
Console.WriteLine("MatchesCount "+matches.Count);
foreach (Match m in matches)
{
   //Console.WriteLine("Match: '" + m.Value + "'");
   //Console.WriteLine("GroupCount: " + m.Groups.Count);
   Console.WriteLine("Want name: " + m.Groups["name"].Value);
   Console.WriteLine("Want value: " + m.Groups["value"].Value);
   Console.WriteLine("Want comment: " + m.Groups["comment"].Value);
}