Help with defining Lookup Pattern for Auto Pickup

I am having trouble coming up with a Lookup Pattern for my images.

I am currently saving/uploading images to the site with this basic pattern:

IMG_2222_examplename_lowres.jpg

While the high res pattern is:

IMG_2222_examplename_highres.jpg

What would the lookup pattern be for this?

Thanks in advance for the help!
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