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  1. <>;
  2.  
  3. while(<>){ # read next line to variable $_
  4. 	chomp;
  5. 	push @{
  6. 		$hash{ 
  7. 			lc ( 
  8. 				/\@bmail\.com$/i ? 
  9. 						join '', map { split /\./ } /^.*?(?=[+\@])/g 
  10. 					: 
  11. 						$_ 
  12. 				) 
  13. 			}
  14. 		}, $_
  15. 	}
  16.  
  17. print join "\n", scalar keys %hash, map @{ $_ } . " @{ $_ }", values %hash
Success #stdin #stdout 0s 6000KB
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stdin
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6
ICPC.@bmail.com
p+con+test@BMAIL.COM
P@bmail.com
a@bmail.com.ru
I.cpc@Bmail.Com
a+b@bmail.com.ru
stdout
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4
2 p+con+test@BMAIL.COM P@bmail.com
2 ICPC.@bmail.com I.cpc@Bmail.Com
1 a+b@bmail.com.ru
1 a@bmail.com.ru
https://ideone.com/MR9MgN
language:
Perl (perl 5.28.1)
created:
9 years ago
visibility:
secret

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