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Advanced Patterns doesn't work in certain context

The problem is related to the "Advanced Patterns" (i.e. Regular expressions).

First of all to "over-simplify" what I want to achieve.. I want to match the word "cat" but not the word "caterpillar".. so the intuitive thing is to use "Look-around assertions":


the above expression should match "cat" but not "caterpillar"..

the problem is McAfee uses Google RE2 not PCRE.. and look-around assertions are not supported in Google RE2.


So the next intuitive thing is to mix the usage of "Matched Expressions" & "Ignored Expressions":

Matched Expressions:


Ignored Expressions:


Now the problem is that the two are matching! (i.e. the DLP endpoint detects both "cat" & "caterpillar").. why is that?



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