Here is one way to do it. This example changes $/ to read the records one at a time. The regex may need to be extended a little and you could use an array instead of a hash. 
    #!/use/bin/perl -w

    use strict;

    my %ports;

    $/ = "#-------------------------------------------\n";

    while (<DATA>) {
        chomp;
        $ports{$1} = $_ if m/^\s+Port (\d+)/;
    }

    print $ports{120};



    __DATA__

    Port 119 NNTP

    * Microsoft Ports-Microsoft Exchange ...
    * RFC977
    * RFC1036

    #-------------------------------------------

    Port 120 CFDP

    (UDP) Coherent File Distribution Protocol (CFDP)

    * RFC1235

    #-------------------------------------------

    Port 123 NTP

    (UDP) NTP (Network Time Protocol)

    * RFC2030
    * RFC1129

[download]

--
John.

In reply to Re: Help Matching Sections of a file by jmcnamara
in thread Help Matching Sections of a file by smaida

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.