Sean wrote,
Additionally, you've not properly escaped the closing bracket:
If the left bracket is escaped and therefore literal, then a bracketed
set hasn't been opened, and there is no need to escape the right
bracket. It will be read as a literal right bracket.
It doesn't hurt, and many people think it's easier to read if the right
bracket is also escaped, but it isn't required.
Note that that doesn't apply to parentheses. If you want to match an
expression with a literal left parenthesis and a literal right
parenthesis farther along, both must be escaped.
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