[PROGRAMMATOR]

Как пример.

PHP код:

    $string = '
        501#
        A potion made from ground Red Herbs that restores ^000088about 45 HP^000000.
        ^ffffff_^000000
        Weight :^777777 7^000000
        #
        502#
        A potion made from ground Red and Yellow Herbs that restores ^000088about 105 HP^000000.
        ^ffffff_^000000
        Weight :^777777 10^000000
        #
    ';
    
    $lines = explode(PHP_EOL, $string);
    $lines = array_map('trim', $lines);
    
    $item = null;
    $desc = null;
    $items = array();
    
    foreach ($lines as $line) {
        if (preg_match('#(^[\d]+)\##', $line, $match)) {
            $item = $match[1];
            continue;
        }
        
        if (preg_match('#^\##', $line)) {
            $items[$item] = $desc;
            $desc = null;
            continue;
        }
        
        $desc .= $line;
    }
    
    var_dump($items); 


array
  501 => string 'A potion made from ground Red Herbs that restores ^000088about 45 HP^000000.^ffffff_^000000Weight :^777777 7^000000' (length=115)
  502 => string 'A potion made from ground Red and Yellow Herbs that restores ^000088about 105 HP^000000.^ffffff_^000000Weight :^777777 10^000000' (length=128)