PostgreSQLdata validation

Check Alphanumeric String in PostgreSQL Using Regex

Validate that a column contains only alphanumeric characters in PostgreSQL using regex. SQL examples for alphanumeric checks.

The Regex Pattern

Regex pattern

^[a-zA-Z0-9]+$

Use this pattern with PostgreSQL's ~ operator.

PostgreSQL SQL Example

-- Use PostgreSQL regex to verify that product codes, reference numbers, or IDs contain only alphanumeric characters
SELECT *
FROM your_table
WHERE your_column ~ '^[a-zA-Z0-9]+$';

How This Works

Use PostgreSQL regex to verify that product codes, reference numbers, or IDs contain only alphanumeric characters. 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 data validation — it avoids loading data into application memory just to filter it with a regex.

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