python正则使用笔记

def remove_br(content):    """去除两边换行符"""    content = content.replace("
", "
").replace("
", "
")    while re.findall("^
|
$", content):        content = re.sub(r'^
|
$', "", content)    return contentif __name__ == "__main__":    s =  remove_br("
ab
c
")    print s

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