pat = r'![]'
pat = r"[a-zA-Z0-9_u4e00-u9fa5.() ]{1,}.(?:png|jpg|gif)" # 比如st = "关于哈哈的需求v2. (2)1_html_fjf3hg4bv5h.jpg" # 匹配到了['关于哈哈的需求v2. (2)1_html_fjf3hg4bv5h.jpg']