As a variation on Polyglot's solution, you can define the tags in a hash. The advantage is that it is more easily expanded if more tags are needed. I have chosen to specify the characters by name (charnames) because I find single punctuation marks, embedded in quotes, hard to read. 
use strict;
use warnings;
my %tags = (
    91 => "\N{FULL STOP}",          # '.'
    92 => "\N{APOSTROPHE}",         # '''
    93 => "\N{COMMA}",              # ','
    94 => "\N{EXCLAMATION MARK}",   # '!'
);
my $line =
    'Text with unusual punctuation<91><91><91>'
   .'I<92>m not going to lie<93> this is odd text<94>'
;

$line =~ s/<(\d\d)>/$tags{$1}/ge;

print $line, "\n";

[download]
Bill

In reply to Re^2: convert tags to punctuation by BillKSmith
in thread convert tags to punctuation by Anonymous Monk

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