2024 day 3 part 2

Author: deckelmouck

2024/Day03/Solution.cs

@@ -1,6 +1,7 @@
 using System;
 using System.Collections.Generic;
 using System.IO;
+using System.Linq;
 using System.Runtime;
 using System.Security.Cryptography.X509Certificates;
 using System.Text.RegularExpressions;
@@ -45,6 +46,60 @@ public void SolvePart1()
 
     public void SolvePart2()
     {
-        throw new NotImplementedException();
+        //var inputFilePath = GetInputFilePath("testtwo");
+        var inputFilePath = GetInputFilePath();
+
+        string[] lines = File.ReadAllLines(inputFilePath);
+
+        string regexpattern =   @"(?:\w*mul\(\d{1,3},\d{1,3}\))|(?:\b(?:un)?do\(\))|(?:\bdon't\(\))";
+        
+        List<string> allmatches = new();
+
+        long totalSum = 0;
+        bool doit = true;
+        foreach (var line in lines)
+        {
+            var matches = Regex.Matches(line, regexpattern);
+
+            foreach(Match match in matches)
+            {
+                allmatches.Add(match.Value);
+
+                if(match.ToString().Contains("mul"))
+                {
+                    if (doit)
+                    {
+                        string temp = match.Value;
+
+                        if (temp.Contains("mul"))
+                        {
+                            // Normalize anything ending in "mul" (e.g., xmul, _mul) to "mul"
+                            temp = Regex.Replace(temp, @"\w*mul", "mul");
+                        }
+
+                        string item = temp.Replace("mul(", "").Replace(")", "");
+
+                        long x = long.Parse(item.Split(',')[0]);
+                        long y = long.Parse(item.Split(',')[1]);
+
+                        totalSum += x * y;
+                    }
+                }
+                else
+                {
+                    if (match.ToString().ToLower().Contains("don't"))
+                    {
+                        doit = false;
+                    }
+                    else
+                    {
+                        doit = true;
+                    }
+                }
+
+            }
+        }
+
+        Console.WriteLine($"total sum is: {totalSum}");    
     }
 }