temp = []
for value in my_dataframe[my_col]:
  match = my_regex.search(value)
  if match:
    temp.append(value.replace(match.group(1),'')
  else:
    temp.append(value)

temp = [value.replace(match.group(1)),'' if (match) else value for
    value in my_dataframe[my_col] if my_regex.search(value)]