How to delete duplicate lines in a list using Regular Expression in python

Question

Is there any way to remove duplicates in a list through Regular expression If we have duplicates in it. without using set operation

["name1", "name2", "name3", "name4", "name1", "name2", "name3", "name4"]

I want output as

["name1", "name2", "name3", "name4"]

What have you tried, and what exactly is the problem with it? Why a regular expression? — jonrsharpe, Mar 30 '20 at 10:18
Why you are opting for regular expression when we have efficient data structure already in place? — Abdul Niyas P M, Mar 30 '20 at 10:19
We are using our own framework which will support RE operations only — himabindu, Mar 30 '20 at 10:22
`set` is a Python built-in. If you don't have access to `set`, you're not even using a standard Python variant (with or without standard library). — 9769953, Mar 30 '20 at 10:25

score 0 · Answer 1 · answered Mar 30 '20 at 10:30

As many of the comments have said, set() is probably what you want in python.

set(["name1", "name2", "name3", "name4", "name1", "name2", "name3", "name4"])

>> ["name1", "name2", "name3", "name4"]

If you really need to use a regex, use the re package along with a regex solution, such as How do I find and remove duplicate lines from a file using Regular Expressions?

1 Answers1