Cron Expression (Quartz/Spring, 6-Field) in GO
Validate 6-field Quartz/Spring cron expressions including the seconds field at the front.
Try it in the GO tester →Pattern
regexGO
^(\*|([0-5]?\d))\s+(\*|([0-5]?\d))\s+(\*|([01]?\d|2[0-3]))\s+(\*|([1-9]|[12]\d|3[01]))\s+(\*|([1-9]|1[0-2]))\s+(\*|\?|[0-7])$Go (RE2) code
goGo
package main
import (
"fmt"
"regexp"
)
func main() {
re := regexp.MustCompile(`^(\*|([0-5]?\d))\s+(\*|([0-5]?\d))\s+(\*|([01]?\d|2[0-3]))\s+(\*|([1-9]|[12]\d|3[01]))\s+(\*|([1-9]|1[0-2]))\s+(\*|\?|[0-7])$`)
input := `0 0 9 * * 1`
for _, match := range re.FindAllString(input, -1) {
fmt.Println(match)
}
}Uses `regexp.MustCompile` (panics on bad patterns at startup) and `FindAllString` for all matches.
How the pattern works
Six fields: seconds (0–59), minutes (0–59), hours (0–23), day-of-month (1–31), month (1–12), and day-of-week (0–7, where Quartz also accepts `?` to mean "no specific value"). Each field also accepts `*` for any value. This is the Quartz/Spring scheduler format — distinct from the standard 5-field Unix cron in batch 1.
Examples
Input
0 0 9 * * 1Matches
0 0 9 * * 1
Input
30 15 12 ? * 5Matches
30 15 12 ? * 5
Input
0 9 * * 1No match
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