37 lines
671 B
Go
37 lines
671 B
Go
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package main
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import (
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"fmt"
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"os"
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"regexp"
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"strconv"
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)
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func check(e error) {
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if e != nil { panic(e) }
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}
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func main() {
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dat, err := os.ReadFile("data.txt")
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check(err)
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dat_str := string(dat)
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// get all numbers within mul(*,*) using capture groups
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r := regexp.MustCompile("mul\\(([0-9]{1,3}),([0-9]{1,3})\\)")
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matches := r.FindAllStringSubmatch(dat_str, -1)
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acc := 0
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for _, elem := range matches {
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// convert to numbers
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num1, err := strconv.Atoi(elem[1])
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check(err)
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num2, err := strconv.Atoi(elem[2])
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check(err)
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acc += num1 * num2
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}
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fmt.Println(acc)
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}
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