f = File.open("foo.txt")

username = ""
password = ""

File.foreach("foo.txt") do |l|

    if l =~ /^\s*username\s*=\s*(\w+)\s*/
        username = $1
    elsif l =~  /^\s*password\s*=\s*(\w+)\s*/
        password = $1
    end

end

puts username
puts password
~