I think you'd want that RE within an if condition, because otherwise the RE could fail to match and you'd load the previous value of $1 into $var 


#!/usr/bin/perl

use warnings;
use strict;

my $str = "http://172.20.37.115:8080/se/1.0/provision/subscribers/1989
+68";

$str =~ /.*\/(\d+)$/;
my $var = $1 || '';

print "$var\n";
# prints 198968

my $str2 = http://172.20.37.115:8080/se/1.0/provision/subscribers/foo"
+;
$str2 =~ /.*\/(\d+)$/;
my $var2 = $1 || '';

print "$var2\n";
#prints 198968

[download]

May be better to do: 

use warnings;
use strict;

my $str = "http://172.20.37.115:8080/se/1.0/provision/subscribers/1989
+68";

if( $str =~ /.*\/(\d+)$/ ) {
  my $var = $1 || '';

  print "$var\n";
}

[download]

In reply to Re^2: how to find particular string and store in to variable by 1nickt
in thread how to find particular string and store in to variable by bhushanQA

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.