False-positive that produces invalid regular expression

[EvgenyOrekhov]

/\]/u is getting optimized to /]/u which produces Parsing error: Invalid regular expression: /]/: Lone quantifier brackets.

[kasugaiasuka]

Same issue, /\{.*\}/u.exec("abc{foo}xyz") is optimized to /{.*}/u.exec("abc{foo}xyz") which produces Uncaught SyntaxError: Invalid regular expression: /{.*}/: Lone quantifier brackets.

The u flag disables Annex B extension, and makes regex behave like strict mode.
I noticed this problem because require-unicode-regexp recommended u to me.

[BrainMaestro]

Please report this issue to the upstream library https://github.com/DmitrySoshnikov/regexp-tree

[EvgenyOrekhov]

Upstream issue: DmitrySoshnikov/regexp-tree#224.

[BrainMaestro]

Great! Once it's fixed, I will be happy to publish an update that includes the fix