How to match all ASCII characters with POSIX regexp

Is there a way match all ASCII characters with POSIX extended regexp? [[:ascii:]] is not available in POSIX ERE.

Solution

You can compose a character class with [:print:] ([\x20-\x7E]) and [:cntrl:]
([\x00-\x1F\x7F]):

[[:print:][:cntrl:]]

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