in reply to Alignment of text using regex

Another option. 

#! perl -sw
use strict;

print pack 'A45 A*', split /\|/ while <DATA>;

__DATA__
ABCDEFGHIJKLMNOPQRST|1234
ABCDEFGHI|12345
ABCDE|1234
ABCDEFGHIJKL|123
ABCDEFG|123456
ABCDEFGHIJKLMNO|12

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