findconst.rb

#!/usr/bin/env/ruby

magicstring = ARGV[0]

classes = []
ObjectSpace.each_object do |o|
  classes << o if o.is_a? Class
end

modules = []
ObjectSpace.each_object do |o|
  modules << o if o.is_a? Module
end

(classes + modules).each do |container|
  container.constants.each do |const|
    if container.const_get(const) == magicstring
      puts "#{container}::#{const}"
    end
  end
end