Function IsCronExpression

pkg/parser/schedule_cron_detection.go:140–158

IsCronExpression checks if the input looks like a valid cron expression A valid cron expression has exactly 5 fields (minute, hour, day of month, month, day of week)

(input string)

// IsCronExpression checks if the input looks like a valid cron expression
// A valid cron expression has exactly 5 fields (minute, hour, day of month, month, day of week)
func IsCronExpression(input string) bool {
	// A cron expression has exactly 5 fields
	fields := strings.Fields(input)
	if len(fields) != 5 {
		cronDetectionLog.Printf("Input is not a cron expression (expected 5 fields, got %d): %q", len(fields), input)
		return false
	}

	// Each field should match cron syntax (numbers, *, /, -, ,)
	for _, field := range fields {
		if !cronFieldPattern.MatchString(field) {
			cronDetectionLog.Printf("Cron field %q contains invalid characters in expression: %q", field, input)
			return false
		}
	}

	cronDetectionLog.Printf("Input recognized as valid cron expression: %q", input)
	return true
}