How to ignore word from global GREP style?

Question

I asked this question to create a GREP style to make the 2 subscript when I typed H2.

I need the GREP to ignore the word H2Van.

I thought to amend the GREP to look for a space after the 2 as well as to look for a H or any uppercase letter before it. This does work, but if there is punctuation after the H2, then the GREP also ignores it.

How would I amend this GREP to ignore the word H2Van?

(?<=\u)2(?=[[:space:]])

Answer 1

If it's just the 2 followed by a V, put the negative expression for the V after the 2 (?!V)

(?<=\u)2(?!V)