On 1/25/22 09:35, Shaozhong SHI wrote:
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.johnston@xxxxxxxxx> wrote:
On Tue, Jan 25, 2022 at 6:56 AM Shaozhong SHI <shishaozhong@xxxxxxxxx> 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.
You would need to add form ~ '_expression_' or form is null
And a body of held water is a reservoir (no 'a')
