In this post, I am sharing an article on how to validate the Email Address Column in PostgreSQL.

In 2016, I already shared a below article on this. This article is similar to the below old article, but here I added “citext” extension which for case-insensitive check.

If you don’t know about the DOMAIN DATA TYPE, visit below old article.

PostgreSQL: CREATE DOMAIN to Abstract Data Type and Enforce Business Rules

Check the below demonstration, and validate the email address column:

Create a new citext extension:
The citext module provides a case-insensitive character string type, citext. Essentially, it internally calls lower when comparing values. Otherwise, it behaves almost exactly like text.

CREATE EXTENSION citext;

Create a domain data type for validating an email address:

CREATE DOMAIN domain_email AS citext
CHECK(
   VALUE ~ '^\w+@[a-zA-Z_]+?\.[a-zA-Z]{2,3}$'
);

Use domain_email and Cast/Compare valid email address:

SELECT 'anvesh@gmail.com'::domain_email;
SELECT 'anvesh_08@dbrnd.org'::domain_email;

Few invalid email addresses:

SELECT 'dba@aol.info'::domain_email;
SELECT 'anvesh_08@08dbrnd.org'::domain_email;