Better: 

my $count = () = $title =~ m{ (?:^|\s)\K \Q$kw\E (?! [^\s,;] ) }xig;

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In reply to Re^5: Regex help \b & \Q by ikegami
in thread Regex help \b & \Q by Anonymous Monk

Title:
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and:  <code> code here </code>
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