code: def replace_period_of_abbr(self, txt, abbr):
      # prepend a space to avoid needing another regex for start of string
      txt = " " + txt
      txt = re.sub(
          r"(?<=\s{abbr})\.(?=((\.|\:|-|\?|,)|(\s([a-z]|I\s|I'm|I'll|\d|\())))".format(
              abbr=re.escape(abbr.strip())
          ),
          "∯",
          txt,
      )
      # remove the prepended space
      txt = txt[1:]
      return txt
  
file_path: pySBD/pysbd/abbreviation_replacer.py
imports: import re
  from pysbd.utils import Text
label_desc: Use image node_id 5 for calling the AbbreviationReplacer obj's underlying member method code with example usage: obj.replace_period_of_abbr(txt, abbr) and returns: txt