Find 3 in a row letters

Question

I need to find if one field contain 3 letters in a row:
Examples:

123abv31231 - Correct
abc12314121 - Correct
asdsadsad12 - Correct
98381233abc - Correct
123123ab123 - Not Correct

Doesn't matter where is the 3 characters. It's only matter they must be at least 3 in a row.
I'm using SQL Server

Answer 1

With the operator LIKE:

select * from tablename
where col like '%[a-z][a-z][a-z]%'

See the demo.
Results:

> | col         |
> | :---------- |
> | 123abv31231 |
> | abc12314121 |
> | asdsadsad12 |
> | 98381233abc |