sleepy i guess :) not anchors, but match an optional word before Guinea, then check 
my( $word, $guinea ) = /(\w+)?\s*\b(Guinea)\b/;
if( $word eq ucfirst $word ){
   warn "Not the Guinea I want ($word $guinea)";
}

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In reply to Re^2: Matching Exact Word by Anonymous Monk
in thread Matching a Word Exactly by GuiPerl

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