I would put all three files on three layers in either Premiere or After Effects, and play with the different blend modes and opacity of each layer until the image looks right. Screen, Add, or Overlay modes will probably be worth trying.
You don't need to use Illustrator to do this - three cheap or free scripts will do it:
Gridder (free) will arrange all the images the way you want:
When you've gridded them as you like, select all the images, and apply a couple of Opacity keyframes on all the layers (to make them go from 0 to 100 opacity at the ...
Here's a photoshop file with four layers - a background, a shape, and two text layers "left" and "right":
I save as PSD, and import them into After Effects using the "Composition -Retain Layer Sizes" option:
Here they are correctly imported into AE with the same positions:
There is not much information about this. I have found a discussion where someone said there could be a bug with regex lookahead, maybe it's not even implemented (source).
Instead, you could capture the last word and add it along with the space (captured elements start with index 1, so $1 is the first and in this case only group):
text = text.replace(/\s([^\...