Hi Andrew,
Thanks very much for this, going to give it a try - I'll let you know.
Think that difference between n-dash and hyphen is what I was missing, although don't see where you've specified the type of dash (no Asc values).
To complete this code also need to include 1 - 3 digit numbers.
I'm dealing with 1 problem at a time, the current index has for example 129-1 - not ideal but understandable

Hi Andrew,
Thanks very much for taking the time to do this, much appreciated.
Huge advance and I've learned alot more from this than Googling in the dark.
I've noticed there's a mixture of formats for page ranges as you can see from below:

Before .................................................. ........ After
average variable (AVC) 108, 305 < > average variable (AVC) 108, 305
external 41–3, 164–5, 175, 186–8 < > external 41–3, 166-7, 175, 188-10
long run 113–14 < > long run 115-34
marginal (MC) 105–6, 110 < > marginal (MC) 107-8, 110
private 41–2, 186 < > private 41–2, 186
short run 106–9 < > short run 108-11
social 186–7 < > social 188-9
credit 16, 205, 206, 215, 258–61, 308 < > credit 16, 205, 206, 215, 260-81, 308

If there's for example 186-8 then After should be 188-0 (to keep the current format)
I have another question, your code includes
This is a regex notation, but there's no mention of a RegExp object. How does that work?
Thanks for all your help

Hi, trying to make this a bit more flexible.
Replaced
With
(this works in regex101: build, test, and debug regex)
but it's not working here, why is this?

As well as finding numeric strings with "-" I also need to find numeric strings from 1 - 999 does that mean running a second aRng.Find ?