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bbfa235
(Get the code!)
There are three types of patterns
(1) word
(2) fnmatch() style
(3) regex
They're all intermangled together, so: A bare word only matches a direct match. If it includes a special character like * then it tries matching a fnmatch pattern first, and if that fails, tries to match a regex. And these expressions are not anchored as you have noticed.
What you want to search for is probably vcard$ or ^vcard. In fact, always include a ^ or a $ when specifying expression, as that forces apt to do regex matching.
Now, it's of course annoying that it is this way, but it's not a bug. I hope we get patterns at some point, so you can search name(regex) without having to worry about this shit. But that's going to take a while.
I guess we can keep this bug open as the pattern tracking bug, unless we already have another one for that, so I'm marking that as triaged for now.