Find and replace of text in math equations

Hi,

I'm looking to change all text [a-zA-Z] in equations to italics using VBA. I don't want to change anything outside of the equations in equation editor, however.

Here's my code:

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This, unfortunately, changes all text to italics, and I can't figure out why...
Thank you for your help!

Hi,

I ended up solving this by:

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This allows me to differentiate between numbers and letters...as I don't want numbers italicized.

If you can think of a better way, please let me know...this is a bit of a hack.