Not only DBI. The E0 is documented in perlop at the flip flop: 
#!/usr/bin/perl
use warnings;
use strict;

while (<DATA>) {
    if (my $flipflop = /start/ .. /end/) {
        print "$flipflop: $_";
    }
}

__DATA__
before
start
1
2
3
end
after

[download]

Output: 

1: start
2: 1
3: 2
4: 3
5E0: end

[download]
($q=q:Sq=~/;[c](.)(.)/;chr(-||-|5+lengthSq)`"S|oS2"`map{chr |+ord
}map{substrSq`S_+|`|}3E|-|`7**2-3:)=~y+S|`+$1,++print+eval$q,q,a,

[download]

In reply to Re^5: The True but Zero value? by choroba
in thread The True but Zero value? by Marshall

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