Day 3! This one was irritating because I was using the wrong test input on b for ages

Author: m4xic

03/03a.py

@@ -0,0 +1,13 @@
+import re
+
+with open('input', 'r') as f: instructions = f.read()
+
+results = re.findall(r"mul\([0-9]{1,3},[0-9]{1,3}\)", instructions)
+
+total = 0
+for result in results:
+    a, b = result.replace("mul(","").replace(")","").split(",")
+    print(f"{result=} {a=} {b=} {int(a) * int(b)=}")
+    total += int(a) * int(b)
+
+print(total)

03/03b.py

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+import re
+
+with open('input', 'r') as f: instructions = f.read()
+
+total = 0
+
+do = True
+print(instructions)
+while instructions:
+    #print(total)
+    if do:
+        # First check there's not a dont() coming up
+        print(instructions[:7])
+        if instructions[:7] == "don't()":
+            do = False
+            continue
+        # Then check if there's a valid mul(xxx,yyy) coming up
+        else:
+            match = re.search(r"mul\([0-9]{1,3},[0-9]{1,3}\)", instructions[:12])
+            if match:
+                #print(match.group())
+                a, b = match.group().replace("mul(","").replace(")","").split(",")
+                total += int(a) * int(b)
+                #print(match.span())
+                instructions = instructions[match.span()[1]:]
+                continue
+            else:
+                instructions = instructions[1:]
+                continue
+
+    else:
+        # Check if there's a do() coming up
+        print(instructions[:4])
+        if instructions[:4] == "do()":
+            do = True
+            continue
+        else:
+            instructions = instructions[1:]
+
+print(total)