Features of Cyrillic in Python Regex

A major advantage of regex in Python is that Cyrillic characters are included in the \w group. Let's replace all Latin and Cyrillic letters in the following string:

txt = 'x232x 456 xax xтекстx'
res = re.sub('x[\w]*x', '!', txt)

print(res)

Code execution result:

'! 456 ! !'

Cyrillic letters can also be searched for using a group in square brackets: [а-я]. But there is a problem with it - the letter 'ё' will not be included here. To include it, you need to add this letter to the group:

res = re.sub('x[а-яё]*x', '!', txt)
print(res)

Code execution result:

'! 456 xax !'

Given a string:

txt = 'wйw wяw wёw wqw'

Write a regex that will find strings matching the pattern: the edges have the letters 'w', and between them is a Cyrillic letter.

Given a string:

txt = 'ааа ббб ёёё ззз ййй ААА БББ ЁЁЁ ЗЗЗ ЙЙЙ'

Write a regex that will find all words matching the pattern: any Cyrillic letter any number of times.