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You are looking at a very old, but free version of the course. If you are interesed the most recent version, check it out on the Perl Maven site. 11.36. Replace string in assembly codeExample 11-9. examples/regex/assembly_source.txt mv A, R3 mv R2, B mv R1, R3 mv B, R4 add A, R1 add B, R1 add R1, R2 add R3, R3 mv X, R2 Example 11-10. examples/regex/assembly_process.pl #!/usr/bin/perl
use strict;
use warnings;
# assuming there are no R4 values then 4 substitutions will do
s/R1/R4/g
s/R3/R1/g
s/R2/R3/g
s/R4/R2/g
# or without any assumption and in one substitution:
my %map = (
R1 => 'R2',
R2 => 'R3',
R3 => 'R1',
);
s/(R[123])/$map{$1}/g
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