a7a03ab0b2
This change will allow to immediately discard invalid values when parsing a logicalBackupSchedule string.
Previously used regular expression '^(\d+|\*)(/\d+)?(\s+(\d+|\*)(/\d+)?){4}$' may pass invalid values to cron, like "00 03 * * 7"
Although "00 03 * * 7" may be valid on some systems, but this value will throw an error when applied to kubernetes.
https://en.wikipedia.org/wiki/Cron
FYI: kubernetes uses cron implementation from go module "github.com/robfig/cron/v3"
https://github.com/robfig/cron/blob/v3/spec.go
https://github.com/robfig/cron/blob/v3/parser.go
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