I would expect the same output of the following two commands, but the first one looks wrong to me:
% echo abc^ABC.123 | sed 's/[^A-z0-9]/_/g'
abc^ABC_123
% echo abc^ABC.123 | sed 's/[^[:alnum:]]/_/g'
abc_ABC_123By the way, gsed does the same. Am I missing something?..
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