It only looks for a single leading “e” or “i”, not any number. I’m guessing those tweaks were added to capture specific proper nouns that weren’t captured by simpler “leading capital letter” regexes, like “iPad” or “eBay”.
"*" is "0 or more" and "+" is "1 or more", it looks for any number of "e" or "i" at the beginning and at least one capital letter. The diagram below the regex is wrong.
The Asus product line, yes (all three Es apparently stand for "easy"). But Asus write it with a capital E on the front. Still, somebody else might not.
Instead of
it looks like they wanted