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Regular Expression (RegEx) pattern for AWS Cron Expressions

Regular expression required to match all valid Cron Expressions for AWS Cloudwatch.

Exact requirements are documented here:
http://docs.aws.amazon.com/AmazonCloudWatch/latest/events/ScheduledEvents.html#CronExpressions

Regex is to be used for field validation, and must therefore match ALL valid Cron Expressions as described in the linked documentation, including wildcards. Any invalid Cron Expressions should not be matched.

Regex will be tested against the requirements using https://regex101.com to confirm accuracy.

Regular Expression (RegEx) pattern for AWS Cron Expressions
Regular expression required to match all valid Cron Expressions for AWS Cloudwatch. Exact requirements are documented here: http://docs.aws.amazon.com/AmazonCloudWatch/latest/events/ScheduledEvents.html#CronExpressions Regex is to be used for field validation, and must therefore match ALL valid Cron Expressions as described in the linked documentation, including wildcards. Any invalid Cron Expressions should not be matched. Regex will be tested against the requirements using https://regex101.com to confirm accuracy.. Happy to answer any questions. Thanks in advance!
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