From: "Peña, Botp" <botp@...>
Date: 2008-06-10T18:43:32+09:00
Subject: Re: To and from hex nibbles

From: daniel åkerud [mailto:daniel.akerud@gmail.com] 
# 'testing 123'.scan(/./).collect { |i| i.unpack('C')[0].to_s(16) }.join
# => "74657374696e6720313233"
# and back to binary:
# "74657374696e6720313233".scan(/../).collect { |i| i.to_i(16) 
# }.pack('C*') # => "testing 123"

s='testing 123'.unpack("H*")[0]
#=> "74657374696e6720313233"

s.scan(/../).map{|i| i.to_i(16)}.pack("C*")
#=> "testing 123"

kind regards -botp