The ISO 14651, and indirectly the Unicode update, have sparked some debate over the canonical use of [a-z] by developers. https://sourceware.org/bugzilla/show_bug.cgi?id=23420 …, https://sourceware.org/bugzilla/show_bug.cgi?id=23393 …
POSIX already has something syntactically close to this, equivalence classes, i.e. [[=0=]-[=9=]], but "An equivalence class expression used as a starting or ending point of a range expression produces unspecified results."
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Is there an implementation under which it works? It would have to expand =0= and then =9= and then find the widest range (which is also unspecified) of COE or collation sequence or something.
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Not that I know of. At first I thought it was supposed to work, but checked and found it's not specified.
End of conversation
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