diff --git a/3/puzzle3.cpp b/3/puzzle3.cpp
index f7bdcff..c8e29df 100644
--- a/3/puzzle3.cpp
+++ b/3/puzzle3.cpp
@@ -7,10 +7,18 @@
 using namespace std;
 
 int main(int argc, char const *argv[])
-{
+{   
+
 
     ifstream puzzle("puzzleInput", ifstream::in);
 
+    if(!puzzle){
+        return 1;
+    }
+
+    //regex
+    regex regexToSearch("(mul\(\d+,\d+\))")
+
     string line;
     while (getline(puzzle, line))
     {