TikTokenizer tiktoken-pattern v1 and v2

[bugm]

I noticed that when using TikTokenizer there are two tiktoken pattern
where

PATTERN_TIKTOKEN = r"[^\r\n\p{L}\p{N}]?+\p{L}+|\p{N}| ?[^\s\p{L}\p{N}]++[\r\n]*|\s*[\r\n]|\s+(?!\S)|\s+"
PATTERN_TIKTOKEN_V2 = "[^\\r\\n\\p{L}\\p{N}]?[\\p{Lu}\\p{Lt}\\p{Lm}\\p{Lo}\\p{M}]*[\\p{Ll}\\p{Lm}\\p{Lo}\\p{M}]+|[^\\r\\n\\p{L}\\p{N}]?[\\p{Lu}\\p{Lt}\\p{Lm}\\p{Lo}\\p{M}]+[\\p{Ll}\\p{Lm}\\p{Lo}\\p{M}]*|\\p{N}| ?[^\\s\\p{L}\\p{N}]+[\\r\\n/]*|\\s*[\\r\\n]+|\\s+(?!\\S)|\\s+"

can you offer some explanation to this two different pattern? Thanks