Python 正则表达式去除重复行

1. Sort lines and remove adjacent duplicates
Match:
(?m)^([\s\S]*)(?:(?:\r?\n|\r)\1)+$
Replace:
\1

2. Keep the last occurrence of each duplicate line in an unsorted file
Match:
(?m)^([^\r\n]*)(?:\r?\n|\r)(?=[\s\S]*^\1$)
Replace:
None

3. Keep the first occurrence of each duplicate line in an unsorted file
Match:
(?m)^([^\r\n]*)$([\s\S]*?)(?:(?:\r?\n|\r)\1$)+
Repace:
\1\2