if by "between" you mean last occurence between: 
#!/usr/bin/env perl

open F, "</tmp/fff";

$b=$between=$energy=0;
while (<F>) {
    if (/energy/i) {
        $energy++;
        $between=$b;
    }
    elsif ($energy) {$b++}
}

print $energy, "/", $between;

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In reply to Re: How to read lines between specific character by fisher
in thread How to read lines between specific character by AG87

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