day_three_part_a.sm

| lines rlx rnx inp muls |
lines := AdventFileReader readLines: 'adventofcode/2024/day_three.txt'.
inp := lines inject: '' into: [:acc :l | acc , l]. "concat lines together" 
rlx := 'mul\([0-9]+,[0-9]+\)' asRegex.
rnx := '([0-9]+)' asRegex.
muls := rlx matchesIn: inp 
	collect: [:m | (rnx matchesIn: m)
		inject: 1 into: [:acc :n | (n asInteger) * acc ]
	].
muls inject: 0 into: [:acc :n | n + acc]