Using Powershell to Find Unused Images on my Site

I developed the following Powershell code to help me isolate images in my website's "images" folder that were not being used by the site code:

$image_folder_mask = ".\website\images\*"
$source_file_mask = ".\website\*.aspx",".\website\*.cs",".\website\*.ascx",".\website\*.master",".\website\styles\*.css"

$image_list = new-object system.collections.arraylist
$image_list.addrange(@(get-item -path $image_folder_mask -include "*.png","*.gif","*.jpg" | select name))

foreach($file in get-item $source_file_mask)
{
   foreach($text in $(get-content $file.fullname))
   {
      #echo $text

      if($text -match "[a-z0-9_]+\.png|[a-z0-9_]+\.gif|[a-z0-9_]+\.jpg")
      {
         foreach($current_match in $matches)
         {
            $searcher = $current_match[0]

            for($i = 0; $i -lt $image_list.count; $i++)
            {
               $searchee = $image_list[$i]

               if($searchee.name.trim() -eq $searcher.trim())
               {
                  $image_list.removeat($i)
               }
            }
         }
      }
   }
}

echo $image_list

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