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readlines.each do |line|
  $s = $1 if /\[(.*)\]/ =~ line
  puts "#{$s} : #{$1} : #{$2}" if /([^ ]+) *= *([^ ]+)/ =~ line
end

Success #stdin #stdout 0s 28224KB

stdin

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[sec1] 
key1=val1 

[sec2] 
key2=val2 
x=y

stdout

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sec1 : key1 : val1
sec2 : key2 : val2
sec2 : x : y

https://ideone.com/FBiZcF

language:

Ruby (ruby 2.5.5)

created:

visibility:

secret

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