Having A Hard Time With LIKE Operator

I want to create a query that extract rows that has a specific word.

i.e.

select * fro table where field like "*ART*"

however it should not retrieve "DART" or "ARTI"

i tried using the following [!a-z] and * like this:

SELECT * from DLs where DLName like "*[!a-z]ART" or DLName like "*[!a-z]ART[!a-z]*" or DLName like "ART[!a-r,s,!t-z]*" or DLName like "ART"

it is very long and complicated - cant i cover it all with one like ?

Also the fact that i also want it to get ARTS (i dont know how to say !a-z expect 's')

Thanx in advance