How about something like this:

/*

Set up test table and data

*/

IF OBJECT_ID('dbo.#test') IS NOT NULL

BEGIN

DROP TABLE #test

END

CREATE TABLE #test

(

test_col VARCHAR(10)

)

DECLARE @int INTEGER,

@string VARCHAR(10)

SET @int = 0

WHILE @int <=223

BEGIN

IF LEN(@string) < 10 OR @string IS NULL

BEGIN

SET @string = ISNULL(@string, '') + CHAR(FLOOR(RAND(@int) * @int + 1))

END

ELSE

Begin

INSERT INTO #test

SELECT

@string

SET @string = ''

END

SET @int = @int + 1

END

/*

Return all the rows

*/

SELECT

*

FROM

#test AS T

/*

Return the rows that return non-alphanumeric characters.

*/

SELECT

*

FROM

#test AS T

WHERE

test_col LIKE '%[^a-z]%' AND

test_col LIKE '%[^0-9]%' AND

test_col LIKE '%[^A-Z]%'