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s = 'lorem.ipsum@gmail.com'
puts s.sub(/\A(..)(.*)@(.*)(..)\z/) { 
	$1 + "*"*$2.length + "@" + "*"*$3.length + $4
}

Success #stdin #stdout 0s 28824KB

stdin

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Standard input is empty

stdout

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lo*********@*******om

https://ideone.com/yquKpO

language:

Ruby (ruby 2.5.5)

created:

visibility:

public

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