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For a given string that may contain any ASCII chars, i.e. that matches .*,
find and print only the chars that are in a given subset.

The string could also have numbers, uppercase, special chars...

Hi,

$ echo '632413741610252847552619172459483022433027602515212950543016701812771409213148672112' | sed 's/../& /g' | xargs -n 3
63 24 13
74 16 10
25 28 47
55 26 19
17 24 59
48 30 22
43 30...

G'day!

fold? paste?

$ type -a fold paste
fold is /usr/bin/fold
paste is /usr/bin/paste

$ man fold paste

both are part of coreutils, ... Wow!

I don't recall knowing these handy...

G'day,

Thanks to all of you for your very prompt replies.

A true pack of wizards ... the lot of you! ;-)

Particular thanks go to Yoda as just last night my 6 y/o daughter and I were humming...

G'day,

Here's a teaser for a sed guru, which I surely am not one, as even my
basic sed skills are rusted from years of not practising ... lol

Ok ... we have a string of digits such as:
...