I dont have time to write out the code but my approach would be as follows
#open the log
#loop through
$chunk_string = "";
while ($line = <FILE>)
{
#do any formatting (chomp etc)
if ($line =~ /datestamp/) #appropriate regex here
{
if ($chunk_string =~ /whateveryouarelookingfor/)
{ #you found it in the current chunk }
$current_datestamp = $1; #update the datestamp
$line =~ s/$current_datestamp//; #ignore the date
$chunk_string = ""; #reset the chunk.
}
$chunk_string .= $line; #add the line to the current chunk.
}
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