docs: def sanitize_tex(original_text):
      """Sanitize TeX text.
  
      :param original_text: the text to sanitize for LaTeX.
  
      :type original_text: str
  
      :returns: the sanitize text.
  
      Text is sanitized by following these steps:
  
      1. Replaces ``\\` by ``\\textbackslash``
      2. Escapes certain characters (such as ``$``, ``%``, ``_``, ``}``, ``{``,
         ``&`` and ``#``) by adding a backslash (*e.g.* from ``&`` to ``\\&``).
      3. Replaces special characters such as ``~`` by the LaTeX equivalent
         (*e.g.* from ``~`` to ``$\\sim$``).
  
      """
      # The backslashes
      sanitized_tex = original_text.replace("\\", r"\textbackslash ")
  
      # Escaping
      sanitized_tex = re.sub(r"([{}])".format("".join(_escaped_char)),
                             r"\\\g<1>", sanitized_tex)
  
      # Replacing
      for character, mod in _char_mod.items():
          sanitized_tex = sanitized_tex.replace(character, mod)
  
      return sanitized_tex