Manipulating strings, Breaking Bad style...

naming_bad.rb

require 'colorize'

periodic_table = %w[H He Li Be B C N O F Ne Na Mg Al Si P
                    S Cl Ar K Ca Sc Ti V Cr Mn Fe Co Ni Cu 
                    Zn Ga Ge As Se Br Kr Rb Sr Y Zr Nb Mo 
                    Tc Ru Rh Pd Ag Cd In Sn Sb Te I Xe Cs 
                    Ba Lu Hf Ta W Re Os Ir Pt Au Hg Tl Pb 
                    Bi Po At Rn Fr Ra Lr Rf Db Sg Bh Hs Mt 
                    Ds Rg Cn Uut Fl Uup Lv Uus Uuo La Ce Pr 
                    Nd Pm Sm Eu Gd Tb Dy Ho Er Tm Yb Ac Th 
                    Pa U Np Pu Am Cm Bk Cf Es Fm Md No]

name = ARGV[0]
name_downcased = name.downcase

matches = []
periodic_table.each do |element|
  element_downcased = element.downcase  
  if name_downcased.include? element_downcased
    matches << element
  end
end

if matches.empty?
  puts name
else
  random_match = matches.sample
  colorized_match = random_match.green
  if name.include? random_match
    puts name.sub(random_match, colorized_match)
  else
    puts name.sub(random_match.downcase, colorized_match)
  end  
end