The flip-flop operator can tell you whether you're between the given lines. No need to hash anything as the output depends on the current line only. 
#!/usr/bin/perl
use warnings;
use strict;

while (<DATA>) {
    if (my $line = /^INFO START$/ .. /^END$/) {
        next if /^$/         # Skip empty lines.
             or $line =~ /E/ # Skip the END line.
             or 1 == $line   # Skip the START line.
             or /^STIME/;    # Skip the header.
        my ($stime, $etime, @cols) = split;
        print "$stime:$etime\t$_\n" for @cols;
        print "\n";
    }
}

__DATA__
... ignore ...

INFO START

STIME      ETIME     COLUMN3    COLUMN4   COLUMN5
aaaa1      bbb1        ccc1       ddd1      eee1
aaaa2      bbb2        ccc2       ddd2      eee2
aaaa3      bbb3        ccc3       ddd3      eee3
aaaa4      bbb4        ccc4       ddd4      eee4

END

... ignore again ...

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لսႽ† ᥲᥒ⚪⟊Ⴙᘓᖇ Ꮅᘓᖇ⎱ Ⴙᥲ𝇋ƙᘓᖇ

In reply to Re: Extract table from a block of text by choroba
in thread Extract table from a block of text by reaper9187

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