Question

I want a .net regular expression for the following:

The user can enter a value like tcm:12312312-221231323 or tcm:23121231-23423423-34234234

All of the entries except ‘tcm’ and the hyphen will be numeric. There will be either one or two hyphens.

Answer 1

^tcm:\d{8}-(\d{9}|\d{8}-\d{8})$ 

That’s either tcm:(eight digits)-(nine digits) or tcm:(eight digits)-(eight digits)-(eight digits)

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^tcm:\d+(-\d+){1,2}$ 

If you’re looking for either tcm:(some digits)-(some digits) or tcm:(some digits)-(some digits)-(some digits)