mssqldata validation

Check Date Format in SQL Server with PATINDEX

Use SQL Server PATINDEX to validate date string formats in T-SQL. Examples for YYYY-MM-DD date format checking in MSSQL.

The Regex Pattern

Regex pattern

%[0-9][0-9][0-9][0-9]-[0-9][0-9]-[0-9][0-9]%

Use this pattern with mssql's REGEXP operator.

mssql SQL Example

-- Validate string dates stored in a SQL Server text column using PATINDEX to check YYYY-MM-DD format compliance
SELECT *
FROM your_table
WHERE your_column REGEXP '%[0-9][0-9][0-9][0-9]-[0-9][0-9]-[0-9][0-9]%';

How This Works

Validate string dates stored in a SQL Server text column using PATINDEX to check YYYY-MM-DD format compliance. The regex pattern is used with mssql's REGEXP 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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