docs: def _copy_replace(src, dst, replacements):
      """Copies the src file into dst applying the replacements dict"""
      with src.open() as infile, dst.open('w') as outfile:
          outfile.write(re.sub(
              '|'.join(re.escape(k) for k in replacements),
              lambda m: str(replacements[m.group(0)]),
              infile.read()
          ))