Ruby RegEx Practice.

find_target_fruits.rb

input = "(apple banana) [()mellon orange {banana}] (apple apple {mellon orange})"

# split input text by (), {}, []
re_matchers = [ /\(.*?\)/, /\{.*?\}/, /\[.*?\]/ ]
results = []
re_matchers.each do |re|
  results.concat(input.scan(re))
end

# count target occurrence
re_targets = /apple|banana|mellon|orange/
result_hash = Hash.new
results.each do |text|
  count = text.scan(re_targets).size
  puts "\t#{text} => #{count}"
  result_hash[text] = count
end

# max
max_val = result_hash.max {|k,v| k[1] <=> v[1]}
puts "answer=#{max_val[1]} text=#{max_val[0]}"

Ruby 正規表現の練習
かっこの中にあるターゲットの単語の個数を調べる