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My solution utilized the append tool.
Steps:
1. text to columns on [Range]
2. Append inputs together
3. Filter ==> tonumber([Postal Area]) >= tonumber([Low Range]) AND tonumber([Postal Area]) <= tonumber([High Range])
4. Summarize
Here's my solution
After building a solution based on generate row and text to column I thought it be more fun to try something else and calculate the region numerically. It's probably not the most robust way of doing this, but assuming the characteristic of the regions don't change too much it would hold up pretty well.
It only works if every region has the same number of postcode, and since R5 ends at 2100 and not 2099 I have to correct for overshooting the region.