Update regex

2024/day-3/solution-2.sh

@@ -3,7 +3,7 @@
 # Filter out do(), don't(), and mul()
 # then strip out tails to get do and don
 # strip out mul() to get numbers
-grep -Po 'do\(\)|don(.)?t\(\)|mul\([0-9]+,[0-9]+\)' input |
+grep -Po 'do\(\)|don.t\(\)|mul\([0-9]+,[0-9]+\)' input |
   grep -Po 'don|do|mul\([0-9]+,[0-9]+\)' |
   sed -E 's/^mul\(([0-9]+),([0-9]+)\)/\1 \2/g' |
   awk '