Please don't suggest that people use clobbery global variables or insecure two-arg open. Something like this is cleaner, safer, and simpler (though I didn't test it, and it may benefit from the use of File::Copy instead of rename):

my $newfile = "svs.conf.$$";

open my $in, '<',  'svs.conf' or die "Can't read svs.conf: $!";
open my $out, '>', $newfile   or die "Can't write '$newfile': $!";

while (<$in>) {
    s/\bbe_address\b =/, $new_value;
    print {$out} $_;
}

close $out;

rename( 'svs.conf', $newfile );

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In reply to Re^2: how to search and replace some text in a .conf file by chromatic
in thread how to search and replace some text in a .conf file by koti688

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