python 正则使用笔记

def remove_br(content):
"""去除两边换行符"""
content = content.replace("<br>", "<br />").replace("<br >", "<br />")
while re.findall("^<br />|<br />$", content):
content = re.sub(r'^<br />|<br />$', "", content)
return content

if __name__ == "__main__":
s =  remove_br("<br><br>ab<br />c<br><br>")
print s