Galhano //127.0.0.1

example:epshetsky@test.com,
rek4@test.com,
rajesh1239@test.com,
mohanraj@test.com,
sam@test.com,
nithin@test.com,
midhunvintech@test.com,
karthickgm27@test.com,
rajesh1239@test.com,
mohanraj@test.com,
nithin@test.com,

I need results back like

epshetsky@test.com,
rek4@test.com,
sam@test.com,
nithin@test.com,
midhunvintech@test.com,
karthickgm27@test.com,

1. sort line with Edit -> Line Operations -> Sort Lines Lexicographically ascending
2. do a Find / Replace:
   • Find What: ^(.*\r?\n)\1+
   • Replace with: (Nothing, leave empty)
   • Check Regular Expression in the lower left
   • Click Replace All

How it works: The sorting puts the duplicates behind each other. The find matches a line ^(.*\r?\n) and captures the line in \1 then it continues and tries to find \1 one or more times (+) behind the first match. Such a block of duplicates (if it exists) is replaced with nothing.

The \r?\n should deal nicely with Windows and Unix lineendings.

https://stackoverflow.com/questions/35329122/find-duplicates-and-delete-all-in-notepad