Yes, it is possible. But why are you slurping into $text?

Slurping is recommended only if the presence of multiple lines of data in a single scalar somehow makes your task easier. Usually this is not the case.

Far from showing us why you needed to slurp, you are asking how to access a particular line.

use warnings;
use strict;
my $PARTICULAR_LINE;  # regex

print '-' x 80;

while (<DATA>) {
    s/========KEYWORD.+\n//;
    print;
    
    if ( /$PARTICULAR_LINE/ ) { access($_) }
}
print '-' x 80;

__DATA__
[download]

This does the same printing job as the code you posted, and it accesses the particular line.