let's if we can recognize snapshots

go.mod

@@ -0,0 +1,3 @@
+module zfsbackup
+
+go 1.13

main.go

@@ -0,0 +1,84 @@
+package main
+
+import (
+	"bufio"
+	"fmt"
+	"os"
+	"regexp"
+)
+
+const zfsRegexStart string = "zfs-auto-snap"
+const zfsRegexIncrement string = "(?P<increment>yearly|monthly|weekly|daily|hourly|frequent)"
+const zfsRegexDateStamp string = "(?P<month>[[:digit:]]{2})-(?P<day>[[:digit:]]{2})-(?P<hour>[[:digit:]]{2})(?P<minute>[[:digit:]]{2})"
+
+var zfsRegex = regexp.MustCompile(zfsRegexStart + "_" + zfsRegexIncrement + "-" + zfsRegexDateStamp)
+
+func testSnapshot(possible string, increment string) (bool, bool) {
+	var matches = zfsRegex.FindStringSubmatch(possible)
+	if matches == nil {
+		return false, false
+	}
+	var isASnapshot = true
+	if matches[1] == increment {
+		return isASnapshot, true
+	} else {
+		return isASnapshot, false
+	}
+}
+
+func isAYearlySnapshot(possible string) bool {
+	_, isYearly := testSnapshot(possible, "yearly")
+	return isYearly
+}
+
+func isAMonthlySnapshot(possible string) bool {
+	_, isMonthly := testSnapshot(possible, "monthly")
+	return isMonthly
+}
+
+func isAWeeklySnapshot(possible string) bool {
+	_, isWeekly := testSnapshot(possible, "weekly")
+	return isWeekly
+}
+
+func isADailySnapshot(possible string) bool {
+	_, isDaily := testSnapshot(possible, "daily")
+	return isDaily
+}
+
+func isAnHourlySnapshot(possible string) bool {
+	_, isHourly := testSnapshot(possible, "hourly")
+	return isHourly
+}
+
+func isAFrequentSnapshot(possible string) bool {
+	_, isFrequent := testSnapshot(possible, "frequent")
+	return isFrequent
+}
+
+func main() {
+	input := bufio.NewScanner(os.Stdin)
+	for input.Scan() {
+		if isAYearlySnapshot(input.Text()) {
+			fmt.Printf("%s\t%s\n", input.Text(), "Is a yearly snapshot.")
+		}
+		if isAMonthlySnapshot(input.Text()) {
+			fmt.Printf("%s\t%s\n", input.Text(), "Is a monthly snapshot.")
+		}
+		if isAWeeklySnapshot(input.Text()) {
+			fmt.Printf("%s\t%s\n", input.Text(), "Is a weekly snapshot.")
+		}
+		if isADailySnapshot(input.Text()) {
+			fmt.Printf("%s\t%s\n", input.Text(), "Is a daily snapshot.")
+		}
+		if isAnHourlySnapshot(input.Text()) {
+			fmt.Printf("%s\t%s\n", input.Text(), "Is an hourly snapshot.")
+		}
+		if isAFrequentSnapshot(input.Text()) {
+			fmt.Printf("%s\t%s\n", input.Text(), "Is a frequent snapshot.")
+		}
+	}
+	if err := input.Err(); err != nil {
+		fmt.Fprintln(os.Stderr, "reading Standard Input:", err)
+	}
+}