re.sub clear solution for Unique Email Addresses by StefanPochmann - python coding challenges

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re.sub solution in Clear category for Unique Email Addresses by StefanPochmann

import re

def unique_emails(emails: list[int]) -> int:
    return len({re.sub(r'\.|\+[^@]*|(@.*)', r'\1', s).lower() for s in emails})

Nov. 18, 2021

Comments:

veky on Dec. 1, 2021, 2:50 a.m.
Clear? Srsly? :-D

przemyslaw.daniel on Dec. 1, 2021, 3:19 p.m.
as unclean as <a href="https://py.checkio.org/mission/unique-email-addresses/publications/przemyslaw.daniel/python-3/2-liner-resplit/">this</a>

StefanPochmann on Dec. 11, 2021, 2:37 a.m.
Is it not? :-). I do find it pretty straightforward, not particularly "creative" or what the other categories are.

veky on Dec. 11, 2021, 2:56 a.m.
Well, "clear as mud" should probably be reworded into "clear as Stefan's regex". :-P In my view, everything there is clear, until I get to the regex. "Aha, it imports re, and receives a list of ints (brainfart, obviously:), and returns an int, which is the number of deduplicated canonical emails, each given by lowering of substitution of every $#@$%&/"##! with first captured group (when $#@$%&/"##! consists of three cases, first two of which don't even have a capturing ()s)." :-D I'd surely classify "substituting something without capturing parentheses with the first captured group" as creative, but it's possible that it's just me. :-)

perimeter on Jan. 11, 2022, 4:57 p.m.
Keep it going Stefan! Long live regexps!

veky on Jan. 11, 2022, 4:58 p.m.
:-D Ah yes, they'll probably live for a looong time, but that's always so with legacy technology. :-]

perimeter on Jan. 11, 2022, 5:10 p.m.
You're right their foundations were laid out as far as 1951! Sure they are very cryptic sometimes but you have to love them.

veky on Jan. 11, 2022, 5:20 p.m.
<blockquote> you have to love them. </blockquote> I surely don't, but that's just because I'm old. I've loved them for about 15 years, I think that's long enough. ;-P

viktor.chyrkin on Dec. 26, 2021, 2:08 p.m.
nnnnniiiiccceee!

lxf42 on March 23, 2022, 11:44 p.m.
I find it weird that you are allowed to use the capturing group of the 3rd alternative to replace the match from the 1rst or 2nd alternative ... but I checked, it seems to be alike in other languages too. nice solution!

kdim on Jan. 9, 2023, 3:38 p.m.
Excelent regexp!

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