Gore shill is foolishly using abnormal characters. These are easy to filter for.
Use this as regex over the Comment field. The square brackets at the begining and end are important,
[a҉ b҉ c҉ d҉ e҉ f҉ g҉ h҉ i҉ j҉ k҉ l҉ m҉ n҉ o҉ p҉ q҉ r҉ s҉ t҉ u҉ v҉ w҉ x҉ y҉ z҉ A҉ B҉ C҉ D҉ E҉ F҉ G҉ H҉ I҉ J҉ K҉ L҉ M҉ N҉ O҉ P҉ Q҉ R҉ S҉ T҉ U҉ V҉ W҉ X҉ Y҉ Z҉]