如何将带格式的字符串转换为纯文本

import re

def convert_to_plain_text(formatted_string):
    # 去除HTML标签
    plain_text = re.sub('<.*?>', '', formatted_string)
    
    # 解码特殊字符序列
    plain_text = plain_text.encode('utf-8').decode('unicode_escape')
    
    # 替换换行符和制表符
    plain_text = plain_text.replace('\n', ' ').replace('\t', ' ')
    
    # 转义特殊字符
    plain_text = plain_text.replace('"', '\\"').replace("'", "\\'").replace("\\", "\\\\")
    
    return plain_text

formatted_string = '<p>This is a <strong>formatted</strong> string.</p>'
plain_text = convert_to_plain_text(formatted_string)
print(plain_text)