$ cat test.pl
#!/usr/bin/perl

use strict;
use warnings;                   # Requires 5.6.0

my $a = 5;

-e -f -s $0 and print "0\n";    # Requires 5.8.0
1 < $a < 10 and print "1\n";    # Requires 5.31.11 / 5.32.0
$a //= 42;                      # Requires 5.10.0
$a =~ s{0\K}{};                 # Requires 5.10.0
$b = $a =~ s{0}{1}r;            # Requires 5.14.0

$ perlver --blame test.pl

 ------------------------------------------------------------
 File    : test.pl
 Line    : 12
 Char    : 12
 Rule    : _regex
 Version : 5.013002
 ------------------------------------------------------------
 s{0}{1}r
 ------------------------------------------------------------