<?php
$input_line = "aaaa delimit bbbb delimit cccc delimit dddd delimit eeee";
if (preg_match("/(.*?)(delimit.*)/s", $input_line, $m)) { echo $m[1] . "\n";
echo $m[2];
}
PD9waHAKCiRpbnB1dF9saW5lID0gImFhYWEgZGVsaW1pdCBiYmJiIGRlbGltaXQgY2NjYyBkZWxpbWl0IGRkZGQgZGVsaW1pdCBlZWVlIjsKaWYgKHByZWdfbWF0Y2goIi8oLio/KShkZWxpbWl0LiopL3MiLCAkaW5wdXRfbGluZSwgJG0pKSB7CiAgZWNobyAkbVsxXSAuICJcbiI7CiAgZWNobyAkbVsyXTsKfQ==