AdventOfCode23/Day7/Parser.cs

using System.Text.RegularExpressions;

namespace Day7;

public partial class Parser
{
    [GeneratedRegex(@"(\S+)\s+(\d+)")]
    private partial Regex HandMatch();
    
    public IEnumerable<Hand> Parse(string inputFile)
    {
        using var reader = File.OpenText(inputFile);

        while (!reader.EndOfStream)
        {
            var line = reader.ReadLine()!;
            var match = HandMatch().Match(line);
            if (!match.Success)
            {
                throw new Exception($"Expected hand and bid, but got: {line}");
            }

            yield return new Hand(match.Groups[1].Value, int.Parse(match.Groups[2].Value));
        }
    }
}