Re: reg. expr. multiple substitutions

Use a hash and a loop:

my %subs = (
    tag1 => 'subst1',
    tag2 => 'subst2',
    ...
);

$str =~ s[$_][$subs{$_}] for keys %subs;
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Depending upon the nature of the text involved, you may need to quotemeta some stuff, but that's the basic idea.

Note however, this is only slightly more compact; it will not be quicker or much easier to maintain.

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