Hi, I am trying to match the word (sample-text) and delete previous line if has a single word that might include (digit,_,-). 
use strict;
use warnings;

my $filename = 'test1.txt';
open(my $fh, '<:encoding(UTF-8)', $filename)
  or die "Could not open file '$filename' $!";

my $line;
my $flag=1;
 while($line=<$fh>)
 {
     if($flag == 0)
     {
         print $line;
         next;
     }
     if($line=~/sample-text/)
     {
         $flag=0;
         print $line;
     }
}

[download]
Content of the test1.txt 
 
Text_1
sample-text file Text_1
 matching the 1st line
 matching the last line
Text
text_1
text-2
sample-text file text-2
 matching the 1st line
 matching the last line

[download]
Expected output 
 
sample-text file Text_1
 matching the 1st line
 matching the last line
text
text_1
sample-text file text-2
 matching the 1st line
 matching the last line

[download]
But it only removes the 1st line, and doesn't look for other lines. Please let me know.

In reply to match a word and delete last line by ArifS

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.