def replace_pre_number_abbr(txt, abbr)
      txt.gsub!(/(?<=\s#{abbr.strip})\.(?=\s\d)|(?<=^#{abbr.strip})\.(?=\s\d)/, '∯')
      txt.gsub!(/(?<=\s#{abbr.strip})\.(?=\s+\()|(?<=^#{abbr.strip})\.(?=\s+\()/, '∯')
      txt