PostgreSQLduplicate detection

Detect Duplicate Records in PostgreSQL Using Regex

Find duplicate rows in PostgreSQL combining regex pattern matching with GROUP BY. SQL examples for deduplication with regex.

The Regex Pattern

Regex pattern

^\+?[0-9\s\-\.\(\)]{7,20}$

Use this pattern with PostgreSQL's ~ operator.

PostgreSQL SQL Example

-- Detect duplicate phone number records in PostgreSQL customers table using regex normalization and GROUP BY
SELECT *
FROM your_table
WHERE your_column ~ '^\\+?[0-9\\s\\-\\.\\(\\)]{7,20}$';

How This Works

Detect duplicate phone number records in PostgreSQL customers table using regex normalization and GROUP BY. 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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