@arr = (1 .. 20);
foreach $i ( 0 .. $#arr ) {
    if ( $i == (5 .. 10) ) {
        print "$i\n";
    }
}

##</code><code>##

@arr = (1 .. 20);
foreach $i ( 0 .. $#arr ) {
    if ( $i == 5 .. 10 ) {
        print "$i\n";
    }
}

##</code><code>##

@arr = (1 .. 20);
foreach $i ( 0 .. $#arr ) {
    if ( $i = (5 .. 10) ) {
        print "$i\n";
    }
}