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puts [
	'ab((((cd))))ef((gh))ij(kl)mn',
	'((((abc));def;((ghi)))',
	'(((foo)) , bar)'
].map {|x| x.gsub(/(\((?:\w+|\g<1>)?\))/, '')}

Success #stdin #stdout 0.01s 6268KB

stdin

Standard input is empty

stdout

abefijmn
((;def;)
( , bar)

https://ideone.com/nxjm9S

language:

Ruby (ruby 2.5.5)

created:

visibility:

secret

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