How to do this using regex in python.
<p>A bit confused trying to do a string match that accepts this:</p>

<p>Lets say a string S = "Download" Here, S can be "Download" or "DOWNLOAD" or "DoWNload". Thus, any character in the string can be an uppercase or a lowercase. Its rather easy to write a regex match for all upper case or all lower case letters or even a mix of letters, but I found it difficult to write a regex match that follows a particular order, which here is "Download". </p>

<p>I hope I was lucid here. </p>
