sounds like an XY problem to me. Why not something like this <pseudocode>?
Update After I finished writing this, I discovered FunkyMonk had already hit on essentially the same plan. ++, FunkyMonk

# Get the data into an array, or grab it a line at a time;

# Read a line/array element to a var, $input;    # ie, up to the first
+ return

$may_be_a_full_entry_or_may_not = $input;

Loop and read the next line to $input;
  use a regex to see if it starts with "day\t"
    if (it matches) {
      STORE $may_be_a_full_entry_or_may_not;
      s/"blank"//;    # or use a capturing regex 
                      # whatever that is: tab, space, multi-spaces???
                      # be careful to make only the first "blank" go a
+way!
      STORE $input;
    }
   else { 
     s/"blank"//;    # or use a capturing regex 
     $input = $may_be_a_full_entry_or_may_not; . $input; # concat the 
+two lines
     STORE $input to your db;
   }
[download]

repeating until done.

The details of the loop are left to you. Note, this is a) in-elegant and b) won't work, obviously, if the data entry folk spread their daily report over 3 lines.

Update2 Fixed formatting. Thank you, injunjoel!