if incident description contains text...?

I want to route all tickets containing a 3 letter acronym to a specific queue. Here's the condition in the ruleset (note the leading and trailing spaces):

[Incident Description][Contains Text( ABC )]

Despite adding the spaces, it would still match a string like wxabcyz and execute the rule. Do you have any suggestions on how to get it to match only "abc" but not "zabcy"?