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$line = qq~I'm looking for the end of a sentence, where possible.  How
+ever, in some cases, I'll need to go with a non-conventional "end" to
+ it, such as:

"Here's a quote by a famous person which is supposed to exceed forty w
+ords and is therefore required to be set apart as a separate, indente
+d paragraph per APA style." (Famous, 1999)
...
      (?:\n|\r|\z|$)   #LAST PRIORITY
   )
   /<span class="s">$1$2</span>/gmx;

$line =~ s~^
(
...
      (?:\z|$)  #2 Priority
   )
  ~$processthis->()~egmx;