fix emojis inside square brackets

[kaustubh-nair]

Fixes #3308
Here's an example on Rubular
I've also added the same test from PR #2634 where it was failing.

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[jywarren]

Wow, this is fantastic!!! Very much appreciated! Merging it now.

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[jywarren]

I see you have another as well, looking. I'm also curious if you're interested in solving this one -- we'd love your help: #1097 -- it relates a bit to this one and is a long-standing need of ours!

Thanks again!