Bad news
RegEx1&&RegEx2 -feature is not implemented.
And if it where, it wouldn't work for your issue, since BRU's RegEx has to match the whole file name always, not search&replace parts only.
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You may already know that you can save and reload current settings.
But three runs on a lot of files can take some time, not to talk about waiting to finish the run before doing the next step
If you want, you can try "ReNamer" at w-w.den4b.com
Replace '-' with ' - '
Replace '_' with ' '
Replace ' ' (double space) with ' ' (single space)
FROM:
A-B-C_D_E_F~~G~~~H~~~~i~~J.txt ( ~ means space )
TO:
A - B - C D E F G H i J.txt
USE:
Add this three rules (and save them for re-use)
1) Replace: Replace all "-" with " - " (skip extension)
2) Replace: Replace all "_" with " " (skip extension)
3) RegEx: Replace expression "\s{2,}" with " " (skip extension) --- or 3) CleanUp: Fix spaces, keep only one (skip extension)
HTH?