SQL Server regular expression

Question

I have the following REGEX:

^[-A-Za-z0-9/.]+$

This currently checks whether the value entered into a textbox matches this. If not, it throws an error.

I need to check whether anything has already gone into the database that doesn't match this.

I have tired:

 SELECT * FROM *table* WHERE ([url] NOT LIKE '^[-A-Za-z0-9/.]+$') 
 SELECT * FROM *table* WHERE PATINDEX ('^[-A-Za-z0-9/.]+$', [url])

UPDATE

So after a bit of research I've realised I don't think I can use REGEXP.

I thought I could do something like this? It's not returning the expected results, but it's running unlike anything else. Can anyone spot anything wrong with it?

SELECT 
    *, 
    CASE 
        WHEN [url] LIKE '^[-A-Za-z0-9/.]+$' 
            THEN 'Match' 
        ELSE 'No Match' 
    END Validates
FROM 
    *table*

Answer 1

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]

Answer 2

Disclaimer: The original question was about MySQL. The SQL Server answer is below.

MySQL

In MySQL, the regex syntax is the following:

SELECT * FROM YourTable WHERE (`url` NOT REGEXP '^[-A-Za-z0-9/.]+$') 

Use the REGEXP clause instead of LIKE. The latter is for pattern matching using % and _ wildcards.

---

SQL Server

Since you made a typo, and you're using SQL Server (not MySQL), you'll have to create a user-defined CLR function to expose regex functionality.

Take a look at this article for more details.