Check if [[# is followed by an invalid anchor name that closes with ]].
[[#
]]
Valid anchor names match [-_A-Za-z0-9.%]+; invalid names are decomposed so the parser can handle the inner [# text] as a described anchor link.
[-_A-Za-z0-9.%]+
[# text]
Check if
[[#is followed by an invalid anchor name that closes with]].Valid anchor names match
[-_A-Za-z0-9.%]+; invalid names are decomposed so the parser can handle the inner[# text]as a described anchor link.