Laravel 5 Cron expression validation

A Cron expression validator is created in Laravel 5.3. Laravel provides a versatile and extendable Validation class. Introducing new validations is done by registering a validation function with the extend method on the Validation facade. A Cron expression validator is created by utilising a cron-expression parser.

The cron-expression parser used here is the fantastic cron-expression Composer package by Michael Dowling.

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