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<p> blah blah ... </blockquote> blah <p>
<p> <b>blah blah</b> ... </blockquote> <b>blah</b> <p>
s/(<.*?>)(.*?)(<.*?>)/$1<b>$2</b>$3/g;
s/(?=(<.*?>)(.*?)(<.*?>))/$1<b>$2</b>$3/g;