Radzen Regex Validator

I have spent hours to find correct format of Regex pattern for RadzenRegexvalidator with no result. My pattern in C# is OK:
Regex.IsMatch(cpa, @"^([1-9]-|[1-9][0-9]-)?[1-9] ([0-9]{1,4})?(/[1-9][0-9]{0,2})?(/[1-9])?$")
(it is for strings like 12-4568/458/1..).
Can you help me how touse in RadzenRegexvalidator
my atempts e.g.
Pattern="^([1-9]-|[1-9][0-9]-)?[1-9] ([0-9]{1,4})?(/[1-9][0-9]{0,2})?(/[1-9])?$"
Pattern=@(@"^([1-9]-|[1-9][0-9]-)?[1-9] ([0-9]{1,4})?(/[1-9][0-9]{0,2})?(/[1-9])?$")
Pattern="^([1-9]-|[1-9][0-9]-)?[1-9] ([0-9]{1,4})?(\/[1-9][0-9]{0,2})?(\/[1-9])?$"
Any hint, please...

part of my code for example:

Try to store it in string. For example, string regexMail="your regex"; and Pattern="@regexMail"