I got this working better that halfway, and its usable. Any other help is welcome! 
while ( defined( $_ = <$Rlog> )) {

    s/^Alert Level\s0*(?:[3-9]|\d{2,})/DEREK\n$&\nSMITH\n/s;
}
continue {

    print  $_;
}

__OUT__
==========================================
Log Entry 11: 13 Feb 2011 07:24:32

DEREK
Alert Level 5
SMITH
: TEST ALERT!!!!!!!!!!!!!!!!!!!!
Keyword: Type-02 127002 1208322
Soft Reset
Logged by: Baseboard Management Controller;
Sensor: System Event
0x204D5787300200C0 FFFF027000120300

==========================================

[download]

In reply to Re^4: splice an array (alternate delimiters) by dbs
in thread splice an array by dbs

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.