Match a regex with Cucumber + Webrat

Testing RSpec
1

Hello folks,
I am trying to learn Cucumber and testing in general.
I am working on a app fo lingustic studies, but for the purpose of
testing it can be compared to a “guess the song” app. When a new quiz is
take, a page shows a number of flash players, each one with a single
track. The app works, but I cannot pass the cucumber test.

Here is my step definition:

Then /^I should see a flash player with "([^\"]*)"$/ do |arg1|
  response.should have_selector('param', :name => 'FlashVars') do
|param|
    param.should =~ /.+#{Regexp.escape("numero-1")}.+/m
  end
end

I have been tweaking the regex a bit (eliminating the .+ and so on) but
the test always fails.
Here’s the response:

    Then I should see a flash player with "Corduroy"
# features/step_definitions/experiment_step.rb:14
      expected: /.+numero\-1.+/m,
           got: <param name="FlashVars"
value="playerID=1&amp;soundFile=/system/tracks/1/original/numero-1.mp3?1250785635
%&gt;">
      <param name="FlashVars"
value="playerID=1&amp;soundFile=/system/tracks/2/original/numero-1.mp3?1250785635
%&gt;">
      <param name="FlashVars"
value="playerID=1&amp;soundFile=/system/tracks/1/original/numero-1.mp3?1250785635
%&gt;">
      <param name="FlashVars"
value="playerID=1&amp;soundFile=/system/tracks/2/original/numero-1.mp3?1250785635
%&gt;">
       (using =~)

Any suggestion?
Thanks in advance.