Given your input, there should be a range of "_" to "U", shouldn't there? "0" and "}" are right next to each other in your alphabet. Anyway, here's my response. I adapted my number-range regex. 
# 48 * 3 = 144 chars
sub GOLF {
#23456789012345678901234567890123456789012345678
my$l=join'',@{+pop};my$a=pop;$l=join',',grep$l=~
s/\Q$_//g,@$a;$a={map{$$a[$_],$$a[$_+1]}0..@$a-2
};$l=~s/(.)(?:,((??{"\Q$$a{$+}"})))+/$1..$+/g;$l
}

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_____________________________________________________
Jeff[japhy]Pinyan: Perl, regex, and perl hacker.
s++=END;++y(;-P)}y js++=;shajsj<++y(p-q)}?print:??;

In reply to Re: (Golf) ranging on alphabet by japhy
in thread (Golf) ranging on alphabet by suaveant

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