How can I create a constraint to check if an email is valid in postgres?

Question

How can I create a constraint to use a regular expression in postgres?

Answer 1

You can also create a domain and use it as a type when defining table columns, e.g.

CREATE DOMAIN email AS TEXT CHECK (VALUE ~* '^[A-Za-z0-9._%-]+@[A-Za-z0-9.-]+[.][A-Za-z]+$');

CREATE TABLE emails (
    email email
);

This way you will not need to redefine the regex every time an email containing columns is used in the database.