Hello, You can put real code into the grep so that it looks this this. That way you can access the sequence number you are refering to. The sequence counter is not visible because grep just uses whether the block evaluates to true or false for the list value (I think!) 
#!/usr/bin/perl -w
use strict;
my @data=(<DATA>);

foreach (grep { my $sequence_number=/START/ .. /STOP/; $sequence_numbe
+r ne 1 and $sequence_number !~ /E0/ and $sequence_number;} @data ) {
  chomp;
  print "$_ Between START and STOP\n";
}

__END__
START
Sausage
Mash
Mushy Peas
STOP
Monkey Nuts
START
Bananas
Custard
STOP
Tarzan

[download]

In reply to Re: flip-flop operator and sequence number by Fool on the Hill
in thread flip-flop operator and sequence number by iakobski

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.