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  1. or download this
     (??{ code })
        ...
    ...
        subexpression may match. The result of evaluation is
        considered as a regular expression and matched as if
        it were inserted instead of this construct.
    
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       1 while s!([BUI])(<+)\s*(.*?)\s*(??{'>' x length $2})!<$1>$3</$1>!;
    
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       "B<<< I<< U<bold underlined text> >> >>>"
    
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      <B><I><U>bold underlined text</U></I></B>
    
  5. or download this
    my $pod2html = qr/
      ([BUI])                  # start of formatting pattern
    ...
      \s*(.*?)\s*              # collect text, without border space
      (??{'>' x length($2)})   # match same number of closing braces
    /x;