sed: Can my pattern contain an “is not” character? How do I say “is not X”?

Question

How do I say \"is not\" a certain character in sed?

Answer 1

From my own experience, and the below post supports this, sed doesn't support normal regex negation using "^". I don't think sed has a direct negation method...but if you check the below post, you'll see some workarounds. Sed regex and substring negation