how to find which elements in a page have a background image matching some substrings using jquery

gistfile1.js

// finds elements that have the keywords 'blue' and 'ajax' in their background-image url
$('*').filter(function() {
    var p = $(this).css('background-image');

    var success = true;

    success &= p.indexOf('blue') != -1;
    success &= p.indexOf('ajax') != -1; 

    if (success)
    {
      console.log(p);
    }

    return success;
})