I also suggest just a 2 pass solution: Just grab all that seems nummeric. Once you do that, process the output with a function. In our case the function will allow only numbers of 3 or 4 characters, and perhaps a comma as separator. Then you can play adding more cases, like a trailing dot, or allow negative numbers, etc. Sure, It can be done in less lines, but this way you can easily document each line with its purpose.

$_="ent 1 12 to 1402, 222-2222, 1304, 555.555.5555 and 501, 777 7777 1
+2,4567 11.111";

sub GO{
 return "LINK($1)$2" if $_[0]=~/^(\d{3,4})(,?)$/;
 # here more cases
 return "NO($_[0])";
};

s/([\.\-\,\d]+)/&GO($1)/gexi;

print $_ . "\n";
[download]

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