my $ignore = '(?:\b'. join('\b|\b', map quotemeta, @ignore). '\b)';
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That's a lot of B's. (I was making a motorboat sound just thinking about that regex. {grin})

Wouldn't this be simpler?

my $ignore = '\b(?:' . join("|", map "\Q$_", @ignore) . ')\b';
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-- Randal L. Schwartz, Perl hacker
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