##
/
^
(?: | [^b].* | b[^a].* | ba[^n].* | ban[^k].* | bank.+ )
nova [ ] scotia
(?: | [^b].* | b[^a].* | ba[^n].* | ban[^k].* | bank.+ )
$
/sx
####
/
^
(?: (?!bank). )*
nova [ ] scotia
(?: (?!bank). )*
$
/sx