The regularsequence or concatenation of social phenomena must be studied to find out what can be done, and what should be done.
为了找出能够做点什么、应该做点什么，必须对社会现象的常规序列或连锁反应进行研究。
2
The most common scenario for matching regular expressions is to start at some point in a character sequence and move forward until all matches have been found and the end of the sequence is reached.
It then builds a new regular expression in indent_pat that matches exactly the same sequence of whitespace at the start of any non-empty line (hence the trailing '\ s').
随后在indent _ pat中构建一个新的正则表达式，精确匹配任何非空行的起始处的相同序列的空白(即拖尾' \ S ')。