Skipping words with GREP

Hello Community,

I am working on a document where i am using  GREP styles. My GREP expressions highlight anything that I do not want to italicize in red (for visual reference). However, they are including any words that have "spl" in it as seen in screenshot below. I only want the single word "spl" or "spl." to be highlighted and others that I have specified. How can I make the GREP expressions skip any words that have "spl" in them? Thank you for any assistance.