操作后查找并替换正则表达式项？

Question

我想做的是这个（伪代码）：search for [[phrase//<img src="example.jpg" />//description (if applicable)]]replace with:<a>phrase<div>Description<br><img src="example.jpg"></div></a>例如，我想转换这个：[[transvaginal pudendal nerve block//<img src="3bc9e18a9fa82a1bd4e0c8c580909389.jpg" />//image of transvaginal pudendal nerve block]]对此：<a>transvaginal pudendal nerve block<div>image of transvaginal pudendal nerve block<br><img src="3bc9e18a9fa82a1bd4e0c8c580909389.jpg" /></div></a>到目前为止，这是我的代码：import reanswer_string = open("answer.txt", "r").read()pattern = re.compile(r"\[\[.*\]\]")for raw_material in re.findall(pattern, answer_string):    copy_material = raw_material    copy_material = copy_material.replace("[[", "")    copy_material = copy_material.replace("]]", "")    copy_material = copy_material.split("//")    if len(copy_material) >= 3:        raw_material = "<a>" + copy_material[0] + "<div>" + copy_material[2] + "<br>" + copy_material[1] + "</div></a>"    else:        raw_material = "<a>" + copy_material[0] + "<div>" + copy_material[1] + "</div></a>"with open('new_answer.txt','w') as f:  f.write(answer_string)  f.close()我以为通过设置raw_material =我可以立即更改短语，但我想不会。有点困惑我如何用正则表达式找到一些东西，操纵它，然后替换这个短语。