The pattern \<@ does not make sense with the default setting of the iskeyword 
option, \< matches the beginning of a word, but @ is not a word character, so 
it shouldn't match anything.  If I

   set isk+=@-@

then the last line is matched.  Maybe the use of @ in iskeyword has mislead 
you; it doesn't mean "@", you need @-@ to match a "@".

Regards, John Little

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