If there is a record delimiter, use it! Read the file record by record, and output only those that contain the wanted ID: 
#!/usr/bin/perl
use warnings;
use strict;


{   local $/ = "==========\n";
    while (<DATA>) {
        print "$/$_" if /ID: 3$/m;
    }
}
__DATA__
==========
Name: blah
ID: 2
==========
Name: blah
ID: 2
==========
Name: here
ID: 3
==========
Name: blah
ID: 2
==========

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لսႽ† ᥲᥒ⚪⟊Ⴙᘓᖇ Ꮅᘓᖇ⎱ Ⴙᥲ𝇋ƙᘓᖇ

In reply to Re: Regex Issue by choroba
in thread Regex Issue by bluesplay106

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
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