hyphen name to camel name

find-hyphen-name.rb

require 'set'
R = /
      \b          # word boundary
      (?<part>    # set group name as "part"
        [a-zA-Z]  # first character must be letter
        [^ _-]*   # the afterward character
      )
      (
        [-_]      # the hyphen or underline
        \g<part>  # get group pattern "part"
      )+          # at least one
      \b
    /x            # ignore comments 
def find_hyphen_name(str) 
  result = SortedSet.new
  str.split.each do |word| 
    if (word.match?(R))
      result << word
    end
  end
  return result
end


set = SortedSet.new
File.foreach(ARGV[0]) do |line|
  set.merge find_hyphen_name(line)
end
puts set.to_a

to-camel-name.rb

R = /(?:(?<=^ )|[-_])[a-zA-Z][^ -_]*/
def to_camel_name(str)
  str.gsub(R) do |s|
    c1 = s[0]
    case c1
    when /a-zA-Z/             # first part
      c1 + s[1..-1].downcase
    else                      # afterward part
      s[1].upcase + s[2..-1].downcase
    end
  end
end

puts to_camel_name("Little Miss-muffet sat_on_HE$R Tuffett eating-her_cURDS And_whey")
# => Little MissMuffet satOnHE$R Tuffett eatingHerCURDS AndWhey

# reference: https://stackoverflow.com/a/63771972/8673576