HMR - match and store only 8 digits header

Hi All,

I have a scenario where I receive 8 digits or 10 digits in the TO header of the SIP INVITE. I need to store the TO header user value when it sends only 8 digits. May I know how to achieve it.

I tried to use below. But it didn't help. It is storing the first 8 digits either way. I do not want to trigger this when I receive 10 digits.

            name                                    Store8DigtTO

            header-name                             TO

            action                                  store

            comparison-type                         case-sensitive

            msg-type                                any

            methods                                 INVITE

            match-value                             

            new-value                               

            element-rule

                    name                                    StoreTO

                    parameter-name                          

                    type                                    uri-user

                    action                                  store

                    match-val-type                          any

                    comparison-type                         boolean

                    match-value                             [0-9]{8,8}
                    new-value

Thank you..!