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Copy file name to clipboardExpand all lines: docs/t-sql/functions/regexp-like-transact-sql.md
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@@ -4,7 +4,7 @@ description: REGEXP_LIKE Returns a Boolean value that indicates whether the text
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author: MikeRayMSFT
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ms.author: mikeray
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ms.reviewer: abhtiwar, wiassaf, randolphwest
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ms.date: 11/18/2025
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ms.date: 11/21/2025
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ms.service: sql
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ms.subservice: t-sql
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ms.topic: reference
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`REGEXP_LIKE` requires database compatibility level 170 and above. If the database compatibility level is lower than 170, `REGEXP_LIKE` isn't available. Other [regular expression scalar functions](regular-expressions-functions-transact-sql.md) are available at all compatibility levels.
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You can check compatibility level in the `sys.databases` view or in database properties. You can change the compatibility level of a database with the following command:
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You can check the compatibility level in the `sys.databases` view or in database properties. You can change the compatibility level of a database with the following command:
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```sql
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ALTERDATABASE [DatabaseName]
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### Cardinality estimation
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To enhance the accuracy of [cardinality estimation](../../relational-databases/performance/cardinality-estimation-sql-server.md) for the `REGEXP_LIKE` function, you can use the `ASSUME_FIXED_MIN_SELECTIVITY_FOR_REGEXP` and `ASSUME_FIXED_MAX_SELECTIVITY_FOR_REGEXP` query hints to adjust the default selectivity values. For more information, see [Query hints](../queries/hints-transact-sql-query.md#use_hint).
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To enhance the accuracy of [cardinality estimation](../../relational-databases/performance/cardinality-estimation-sql-server.md) for the `REGEXP_LIKE` function, use the `ASSUME_FIXED_MIN_SELECTIVITY_FOR_REGEXP` and `ASSUME_FIXED_MAX_SELECTIVITY_FOR_REGEXP` query hints to adjust the default selectivity values. For more information, see [Query hints](../queries/hints-transact-sql-query.md#use_hint).
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These query hints are also integrated with [Cardinality estimation (CE) feedback](../../relational-databases/performance/intelligent-query-processing-cardinality-estimation-feedback.md). The CE feedback model automatically identifies queries using`REGEXP_LIKE` function where there's a significant difference between estimated and actual row counts. It then applies the appropriate selectivity hint at the query level to improve plan quality without requiring manual input.
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These query hints also integrate with [Cardinality estimation (CE) feedback](../../relational-databases/performance/intelligent-query-processing-cardinality-estimation-feedback.md). The CE feedback model automatically identifies queries that use the`REGEXP_LIKE` function where there's a significant difference between estimated and actual row counts. It then applies the appropriate selectivity hint at the query level to improve plan quality without requiring manual input.
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To disable the automatic feedback behavior, enable trace flag 16268.
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## Examples
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Select all records from the `Employees` table where the first name starts with `A` and ends with `Y`
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Select all records from the `Employees` table where the first name starts with `A` and ends with `Y`:
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```sql
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SELECT*
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FROM Employees
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WHERE REGEXP_LIKE (FIRST_NAME, '^A.*Y$');
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```
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Select all records from the `Employees` table where the first name starts with `A` and ends with `Y` using case-insensitive mode
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Select all records from the `Employees` table where the first name starts with `A` and ends with `Y`, using case-insensitive mode:
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```sql
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SELECT*
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WHERE REGEXP_LIKE (PRODUCT_NAME, '[AEIOU]{3,}');
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```
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Create employees table with `CHECK` constraints for `Email` and `Phone_Number` columns:
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Create an employees table with `CHECK` constraints for the`Email` and `Phone_Number` columns:
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