regexr
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Unicode category runs succesfully but UI reports parsing error
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As you can see it is matching with no issues, but some part of the UI is reporting a parsing error.
Interesting. I know I pulled the list from some standards doc somewhere, but it appears to be missing some categories, though I can't see an obvious pattern as to what is missing.
We should update the list based on this, which should be exhaustive: https://tc39.es/ecma262/#sec-runtime-semantics-unicodematchproperty-p