c# - Problems validating Regex.IsMatch -


i have problem regx.ismatch. need validate string in format, @"[o]-[0-9]{8}-[0-9]{5}-[0-9]-[0-9]-[0-9]", using code: 

if (!regex.ismatch(vm.cadastralnumber, @"[o]-[0-9]{8}-[0-9]{5}-[0-9]-[0-9]-[0-9]"))        modelstate.addmodelerror("cadastralnumber", "prefix should o, or format not correct"); .

but got problem, after format need user not allow write more number -[0-9]-[0-9]-[0-9]-[0-9]. never stops, need users write format gave first, ad not alow writting more -. help?

write @"^[o]-[0-9]{8}-[0-9]{5}-[0-9]-[0-9]-[0-9]$" make regex match beginning (^) , end ($) of string.


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