Added "☆" (U+2606) to the regexes, because it's not tagged as Extended_Pictographic, even though "★" (U+2605) is.
Changed the "emojis in between letters" regex to use a lookahead for the second letter, in order to allow matches to overlap. This fixes letter-emoji-letter-emoji-letter cases such as "R☆T☆R".
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fix for https://www.youtube.com/watch?v=7lpZ_dEvLSs
Extended_Pictographic
, even though "★" (U+2605) is.