re.findall() function python

Question

你能帮我理解下面这行代码吗?

import re 
a= re.findall('[А-Яа-я-s]+', string)

我对必须在字符串中找到的模式有点困惑。特别是，字符串应该以A开始，以A和я之间的任何字符串结束，应该用-和空格分隔，但是第二项Яа代表什么?

Answer 1

[         ]      any of the characters in here
А-Я             any character from А and Я, inclusive
а-я          any character between а and я, inclusive
-         the character -   (this is ambiguous; it should only be at the very start or end of the class)
s       any whitespace character
+     at least one of the preceding class of characters
[А-Яа-я-s]+     at least one character between А and Я (uppercase or lowercase), a dash, or whitespace

[]被称为"类"在正则表达式中，它的意思是说，这里的任何字符都是有效的。然后+表示"至少出现一次前面的字符/类"。Python有一个正则表达式规则，你可能会觉得阅读它很有用。