sql server #region

(I am developer of SSMSBoost add-in for SSMS)

We have recently added support for this syntax into our SSMSBoost add-in.

--#region [Optional Name]
--#endregion

It has also an option to automatically "recognize" regions when opening scripts.

Not really, Sorry! But...

Adding begin and end.. with a comment on the begin creates regions which would look like this...bit of hack though!

Otherwise you can only expand and collapse you just can't dictate what should be expanded and collapsed. Not without a third-party tool such as SSMS Tools Pack.

BEGIN...END works, you just have to add a commented section. The easiest way to do this is to add a section name! Another route is to add a comment block. See below:

BEGIN  -- Section Name
/* 
Comment block some stuff  --end comment should be on next line
*/

 --Very long query
SELECT * FROM FOO
SELECT * FROM BAR
END

Not out of the box in Sql Server Management Studio, but it is a feature of the very good SSMS Tools Pack