#!/usr/bin/perl
use warnings;
use strict;

while (<DATA>) {
    if (/^INFO START$/ .. /^END$/ and not //) {
        print "$_";
    }
}

__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 ...

##</code><code>##

 
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