code: def replace_prepositive_abbr(txt, abbr):
      # prepend a space to avoid needing another regex for start of string
      txt = " " + txt
      txt = re.sub(
          r"(?<=\s{abbr})\.(?=(\s|:\d+))".format(abbr=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 2 for calling a global function with example usage: replace_prepositive_abbr(txt, abbr) and returns: txt