Help counting amount of elements changed


I set up an alert that currently listing elements im interested in, But i would like to alert only if the number of elements increased or only if decreased.

For example regex set to “apple|orange|tomato” lists several instances of each. and alerts me when there is a change (like one tomato was removed or added).
But i would like it to trigger only if the number increased, and not when decreased, as now it is 50% unwanted.

Will using condition Added text is not empty help?