MySQLduplicate detection

Deduplicate Phone Records by Normalizing Format in MySQL

Normalize phone number formats using REGEXP_REPLACE in MySQL then deduplicate. SQL examples for phone deduplication.

The Regex Pattern

Regex pattern

[^0-9]

Use this pattern with MySQL's REGEXP operator.

MySQL SQL Example

-- Use REGEXP_REPLACE to strip non-numeric characters from phone numbers then find duplicates using GROUP BY
SELECT *
FROM your_table
WHERE your_column REGEXP '[^0-9]';

How This Works

Use REGEXP_REPLACE to strip non-numeric characters from phone numbers then find duplicates using GROUP BY. The regex pattern is used with MySQL'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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