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Data Annotation Validation Of TimeSpan Property In Model Using RegularExpression Attribute

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Hello,

To validate a model property of type TimeSpan using Data Annotation RegularExpression attribute, the expressions should check the hours, minutes and seconds since the corresponding database column in SQL Server that is mapped with this field has a Time data type. The example below validates a 23 hour format military time and does not allow minutes or seconds greater than zero. 
[RegularExpression(@"^(?:[01][0-9]|2[0-3]):[0-0][0-0]:[0-0][0-0]$", ErrorMessage ="Invalid time format and hh:mm:ss values.")]

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