Skipping words with GREP

[r5dsign]

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.

[winterm · Accepted solution]

This will find spl and spl.

\bspl\b\.?

This won’t bother about case, so positives are:

spl, spl., Spl, Spl., SPL, SPL. etc.

(?i)\bspl\b(?-i)\.?