Code comment request: explanatory comment for templateLitReg (parse.ts)

[jayaddison]

This regex is used to find closing multiline strings, if I interpret its usage correctly.

However: it's not super clear to me how the pattern -- or the subpatterns within it -- work when matching. I think a lot of relates to handling variable/call interpolation syntax (e.g. ${x + 1}).
it
I'm not the best at comprehending regular expressions, but perhaps a short paragraph before the pattern could help to explain how it functions.

Ref:

eta/src/parse.ts

Line 24 in 78c256c

var templateLitReg = /`(?:\\[\s\S]|\${(?:[^{}]|{(?:[^{}]|{[^}]*})*})*}|(?!\${)[^\\`])*`/g

Edit: add code link