课程视频地址：
https://edu.csdn.net/course/detail/28645
搜索文档树find_all方法-text参数
text参数
文档内容如下：
html_doc = “”"
The Dormouse's story
Once upon a time there were three little sisters; and their names were Elsie, Lacie and Tillie; and they lived at the bottom of a well.
...
"""通过text参数可以搜搜文档中的字符串内容.与name参数的可选值一样,text参数接受 字符串 , 正则表达式 , 列表等。看例子: