PostgreSQLduplicate detection

Find Duplicate Emails in PostgreSQL with Regex Validation

Detect duplicate valid email addresses in PostgreSQL using GROUP BY with regex filtering. SQL deduplication examples.

The Regex Pattern

Regex pattern

^[a-zA-Z0-9._%+\-]+@[a-zA-Z0-9.\-]+\.[a-zA-Z]{2,}$

Use this pattern with PostgreSQL's ~ operator.

PostgreSQL SQL Example

-- Find duplicate email records in a PostgreSQL users table using GROUP BY combined with regex format validation
SELECT *
FROM your_table
WHERE your_column ~ '^[a-zA-Z0-9._%+\\-]+@[a-zA-Z0-9.\\-]+\\.[a-zA-Z]{2,}$';

How This Works

Find duplicate email records in a PostgreSQL users table using GROUP BY combined with regex format validation. The regex pattern is used with PostgreSQL's ~ operator to filter rows at the database level.

Using regex directly in SQL is efficient for use cases like duplicate detection — it avoids loading data into application memory just to filter it with a regex.

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