How about adding null as an alteration. Would this be robust?
Regards, David On Tue, 25 Jan 2022 at 14:25, David G. Johnston <david.g.johns...@gmail.com> wrote: > On Tue, Jan 25, 2022 at 6:56 AM Shaozhong SHI <shishaozh...@gmail.com> > wrote: > >> select form from mytable where form ~ >> '^Canal$|^Drain$|^Foreshore$|^inlandRiver$|^Lake$|^lockOrFlightOfLocks$|^Marsh$|^Researvoir$|^Sea$|^tidalRiver$|^Transfer$' >> > > You do not need to repeat the boundary metacharacters on each branch. You > can assert their presence just once and then use parentheses to group the > alternations. > > form ~ '^(?Canal|Drain|etc...)$' > > David J. > >
