SQL Server Regex

Using RegEx in SQL Server

You do not need to interact with managed code, as you can use LIKE:

CREATE TABLE #Sample(Field varchar(50), Result varchar(50))
GO
INSERT INTO #Sample (Field, Result) VALUES ('ABC123 ', 'Do not match')
INSERT INTO #Sample (Field, Result) VALUES ('ABC123.', 'Do not match')
INSERT INTO #Sample (Field, Result) VALUES ('ABC123&', 'Match')
SELECT * FROM #Sample WHERE Field LIKE '%[^a-z0-9 .]%'
GO
DROP TABLE #Sample

As your expression ends with + you can go with '%[^a-z0-9 .][^a-z0-9 .]%'

EDIT:

To make it clear: SQL Server doesn't support regular expressions without managed code. Depending on the situation, the LIKE operator can be an option, but it lacks the flexibility that regular expressions provides.

Regex 2 letters and 3, 4 or 5 digits

One option is to use string_split().

Note the last two OR's may not be necessary, just more precise.

Example

Declare @YourTable Table ([SomeCol] varchar(50))
Insert Into @YourTable Values 
 ('Joe Brown AB12345 21223355')
,('Joe Brown AB1234 21223355')
,('Joe Brown AB123 21223355')

Select * 
 From  @YourTable A
 Cross Apply string_split(SomeCol,' ') B
 Where B.value like '[A-Z][A-Z][0-9][0-9][0-9]'
    or B.value like '[A-Z][A-Z][0-9][0-9][0-9][0-9]'
    or B.value like '[A-Z][A-Z][0-9][0-9][0-9][0-9][0-9]'

Returns

SomeCol                     value
Joe Brown AB12345 21223355  AB12345
Joe Brown AB1234 21223355   AB1234
Joe Brown AB123 21223355    AB123

SQL Regex Expression

select *
from
(
values ('ABC-12345'), ('AB-123'), ('A-12345'), ('A1B-1234'), ('ABC12345'), ('xyz-12'), ('klmno-12345'), ('abc.12345')
) as t(v)
where v like '[A-Z]%-%[0-9]' --values start with letter & contain a hyphen & end with a digit
--left part
and len(substring(v, 1, charindex('-', v)-1)) between 1 and 3 --the left part is 1-3 chars long
and substring(v, 1, charindex('-', v)-1) not like '%[^A-Z]%'--the left part has only letters
--right part
and len(stuff(v, 1, charindex('-', v), '')) between 3 and 5 --right part is 3-5 chars long
and stuff(v, 1, charindex('-', v), '') not like '%[^0-9]%'; --and it contains only digits

MSSQL Regular expression

This is what I have used in the end:

SELECT *, 
  CASE WHEN [url] NOT LIKE '%[^-A-Za-z0-9/.+$]%' 
    THEN 'Valid' 
    ELSE 'No valid' 
  END [Validate]
FROM 
  *table*
  ORDER BY [Validate]

Complex RegEx in T-SQL

I would recommend writing a user defined function using SQLCLR. Since .Net supports Regex you can port it to T-SQL. First link in Google gave this implementation, but there may be other (better) implementations.

Caveat - use of SQLCLR requires elevated permissions and may lead to security issues or performance issues or even issues with stability of the SQL Server if not implemented correctly. But if you know what you are doing this may lead to significant enhancements of T-SQL specific for your use cases.

SQL Server regex alternation

SQL Server does not support formal regex, so you will have to use LIKE here:

SELECT TOP 100 *
FROM posts
WHERE tags LIKE '%c++%' OR tags LIKE '%performance%';

Note: If the tags column really stores one tag per record, then just use equality checks:

SELECT TOP 100 *
FROM posts
WHERE tags IN ('%c++', 'performance');

Regex in SQL Server, how can i found only certain length of integers

SQL Server does not have Regex. Even if it did, I wouldn't recommend it here

You can just use a cast and BETWEEN

WHERE TRY_CAST(YourColumn AS int) BETWEEN 100 AND 999

If the column is actually an int then you don't even need a cast.

SQL Server telephone regex check

SQL Server does not support Regex natively. It does have pattern matching, however, the functionality is no where near that of Regex.

For what you have you would need to do:

SELECT PhoneNumber
FROM Sales.Customers
WHERE PhoneNumber NOT LIKE '([0-9][0-9][0-9]) [0-9][0-9][0-9][-][0-9][0-9][0-9][0-9]';

Edit: OP has now edited to LIKE (was NOT LIKE). Not sure which they want, so I have left as NOT LIKE, as per their original version.

T-SQL Equivalent of regular expression '\b'

I think pattern '%"Id":1234[^a-zA-Z0-9]%' will do.

It uses negated character class [^a-zA-Z0-9], which works as in regular regex :)

Sample:

declare @tbl table (col varchar(100));
insert into @tbl values 
('{"Id":1234, "Title": "The quick brown"}'),
('{"Id":1234, "Title": "The quick brown"}'), 
('Id":1234, "Title": "The quick brown"}'), 
('{"Id":12345, "Title": "The quick brown"}');

select *
from @tbl
where col like '%"Id":1234[^a-zA-Z0-9]%'

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