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  1. or download this
    $foo = "<italic>Here's a <bold>larger<normal> paragraph, <italic>where
    + I'm<norma
    l> going to <bold>bold some <italic>";
    ...
    #foo.gsub!(/(?<=<italic>)(?<!<normal>)(.*?)<bold>/, '\1<bold-italic>')
    $foo =~ s/(?<=<italic>)(?<!<normal>)(.*?)<bold>/\1<bold-italic>/g;
    print "foo after:\n$foo\n";
    
  2. or download this
    # Output is...
    # <italic>Here's a <bold-italic>larger<normal> paragraph, <italic>wher
    +e I'm<normal> going to <bold-italic>bold some <italic>
    
  3. or download this
    # However, should be...
    # <italic>Here's a <bold-italic>larger<normal> paragraph, <italic>wher
    +e I'm<normal> going to <bold>bold some <italic>