add day19; to slow to solve part2

day19/towelpatterns.go

@@ -0,0 +1,31 @@
+package main
+
+import (
+    "fmt"
+    "regexp"
+    "strings"
+    "os"
+)
+
+func check(err error) {
+    if err != nil { panic(err) }
+}
+
+func main() {
+    dat, err := os.ReadFile("data.txt")
+    check(err)
+    input := strings.TrimSpace(string(dat))
+    
+    towels   := strings.Split(input, "\n\n")[0]
+    towels    = strings.Replace(towels, ", ", "|", -1)
+    patterns := strings.Split(input, "\n\n")[1]
+    
+    r := regexp.MustCompile("^(" + towels + ")+$")
+
+    counter := 0
+    for _, line := range strings.Split(patterns, "\n") {
+        if r.MatchString(line) { counter++ }
+    }
+
+    fmt.Println(counter)
+}