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We need to process several strings in utf-8 and need to use
regular expressions to match pattern, for ex.:
r"[ANY_LANGUAGE_UPPERCASE_LETTER,0-9ANY_LANGUAGE_LOWERCASE_LETTER]+|NOT_ANY_LANGUAGE_CURRENCY"

We don't know how to implement this logic by our hands.

Also, I found this logic implemented in Microsoft dot NET
regular expressions:

\p{name}        Matches any character in the named character
class 'name'. Supported names are Unicode groups and block
ranges. For example Ll, Nd, Z, IsGreek, IsBoxDrawing, and Sc
(currency). 

\P{name}        Matches text not included in the named
character class 'name'. 

We need same logic in regular expressions.