Search a website for permutations of "Fillion"

fillion.rb

#!/usr/bin/env ruby
# coding: UTF-8

require 'uri'
require 'net/http'
require 'bundler'
Bundler.require :default

# Returns all permutations of the letters in +str+.
#
# @param [String] str
# @return [Array] all permutations of the letters in +str+
def permutations str
  str = str.to_s
  return [str] if !str || str.size <= 1
  letters = str.split(//)
  perms = []
  letters.each_with_index do |letter, index|
    rest = str[0...index] + str[index+1..-1]
    perms += permutations(rest).map {|perm| letter + perm}
  end
  perms.uniq
end

# Searches the text at +url+ for +regex+. Returns each matching line.
#
# @param [String] url
# @param [Regexp] regex
# @return [Array<String>] each line from +url+ matching +regex+
def search url, regex
  begin
    uri = URI.parse(url)
  rescue URI::InvalidURIError => e
    puts e.inspect
    return []
  end

  lines = []
  body = Net::HTTP.get(uri)
  doc = Nokogiri::HTML(body)
  doc.root.text.each_line do |line|
    lines << line if line =~ regex
  end
  lines
end

# @return [String] the usage information for this script
def usage
  %Q{#{$0} URL

#{$0} searches the response of the given URL for permutations of Fillion.
}
end

if !ARGV[0]
  puts usage
  exit false
end

puts search(ARGV[0], /#{permutations('fillion').join '|'}/i).join "\n"

Gemfile

source :rubygems

gem 'nokogiri', '~> 1.5.0'