The documentation for glob character classes is innacurate: > Within [ and ], character classes can be specified using the syntax > [:class:], where class is one of the following classes defined in the > POSIX standard: > alnum alpha ascii blank cntrl digit graph lower print punct space > upper word xdigit > A character class matches any character belonging to that class. The > word character class matches letters, digits, and the character _.
Out of those classes, [:ascii:] and [:word:] are not defined by the POSIX standard. [:word:] is clarified, but [:ascii:] isn't, so it is easy to miss that bash supports [:ascii:] when glancing that part of the documentation. I think it should be clarified that bash supports all the standard character classes, and that [:word:] and [:ascii:] are supported extensions. o/ emanuele6
