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@@ -0,0 +1,50 @@
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+package main
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+
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+import (
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+ "bufio"
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+ "fmt"
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+ "log"
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+ "os"
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+ "regexp"
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+)
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+
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+func readInput(file *os.File) [][]int {
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+ scanner := bufio.NewScanner(file)
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+ var muls [][]int
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+
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+ for scanner.Scan() {
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+ line := scanner.Text()
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+ if line == "" {
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+ break
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+ }
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+
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+ re := regexp.MustCompile(`mul\(\d+,\d+\)`)
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+ matches := re.FindAllString(line, -1)
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+ for _, match := range matches {
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+ mul := make([]int, 2)
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+ n, err := fmt.Sscanf(match, "mul(%d,%d)", &mul[0], &mul[1])
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+ if n != 2 || err != nil {
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+ log.Fatalf("Bad input: %s", err)
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+ }
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+
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+ muls = append(muls, mul)
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+ }
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+ }
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+
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+ return muls
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+}
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+
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+func main() {
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+ if len(os.Args) < 2 {
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+ log.Fatal("You need to specify a file!")
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+ }
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+
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+ filePath := os.Args[1]
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+ file, err := os.Open(filePath)
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+ if err != nil {
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+ log.Fatalf("Failed to open %s!\n", filePath)
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+ }
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+
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+ muls := readInput(file)
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+ fmt.Println(muls)
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+}
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