SQLiteduplicate detection

Find Duplicate Values in SQLite Using REGEXP

Detect duplicate column values in SQLite using REGEXP with GROUP BY. SQL examples for data deduplication in SQLite.

The Regex Pattern

Regex pattern

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

Use this pattern with SQLite's REGEXP operator.

SQLite SQL Example

-- Find duplicate values in a SQLite contacts table using GROUP BY HAVING COUNT > 1 with REGEXP filter
SELECT *
FROM your_table
WHERE your_column REGEXP '^[a-zA-Z0-9._%+\\-]+@[a-zA-Z0-9.\\-]+\\.[a-zA-Z]{2,}$';

How This Works

Find duplicate values in a SQLite contacts table using GROUP BY HAVING COUNT > 1 with REGEXP filter. The regex pattern is used with SQLite's REGEXP 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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