Monks, I'm using the following to identify 4 digit numbers in a string. I replaces the number with a hyperlinked number. It works, but I don't want to use it if a number is within a date format (i.e. 2018-01-01). I'm not sure how to say, look for the 4 digits unless it has a dash after it. 
my $digits_4 = qr{ \b \d{4} \b }xms;
$text =~ s{ ($digits_4) }
          {<a href="script.pl?do_what=view&unit=$1"><b>$1</b></a>}xmsg
+;

[download]
Thanks!

In reply to Identifying 3 or 4 digits by htmanning

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