PostgreSQLdata validation

Find Empty Strings and Whitespace in PostgreSQL Using Regex

Use PostgreSQL regex to identify empty, whitespace, and NULL string values in text columns. SQL data quality check examples.

The Regex Pattern

Regex pattern

^\s*$

Use this pattern with PostgreSQL's ~ operator.

PostgreSQL SQL Example

-- Audit a PostgreSQL table for data quality by finding rows where text columns are empty or contain only whitespace
SELECT *
FROM your_table
WHERE your_column ~ '^\\s*$';

How This Works

Audit a PostgreSQL table for data quality by finding rows where text columns are empty or contain only whitespace. 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.

Need a custom SQL + Regex query?

Describe your specific use case in plain English. RegSQL generates the exact PostgreSQL query with the right regex pattern for your schema.

🤖 Generate PostgreSQL SQL Free 🔍 Generate Regex Pattern

Related SQL Patterns

Validate Email Address in PostgreSQL with Regex

Use PostgreSQL ~ operator to validate email addresses. SQL examples for email validation with regex in Postgres databases.

PostgreSQL

Validate Email in SQLite Using REGEXP

Validate email addresses in SQLite using the REGEXP operator. Setup instructions and SQL examples for email format checking.

SQLite

Validate Email Address in SQL Server with PATINDEX

Validate email format in SQL Server using PATINDEX or LIKE patterns. T-SQL examples for email validation in SQL Server.

mssql

Extract Email Domain in PostgreSQL with regexp_replace

Use PostgreSQL regexp_replace to extract the domain part from email address columns. SQL examples for email domain analysis.

PostgreSQL