E-MAİL REGULAR EXPRESSION

Hey there,

I just want to write a regular expression to block what ı do not want to inside e-mail subject.

I blocked e-mail like Subject=Re: [mkpuk-chat] A Search for Truth and Collective -> I already blocked e-mail like come from.

But If the subject is like Subject=[mkpuk-announcements] or like this Subject=[mkpuk-announcements] Staying Connected this Week: Coffee & PI -> I could not prevent e-mail.

I don't know why and I just write a regular expression like this -> "^\Dmkpuk-\w+"

So If the [mkpuk-chat ] come to the beginning of the line, ı could not prevent but after It comes something, ı prevented it.

Does anyone help me with this topic? Thanks

Best Regards