How to fix the code?

Question

Google Sheets

Code =REGEXEXTRACT(INDEX( IMPORTHTML
(G99;"table";0);2;1);".*?\d+\s*\-.*?(\d+)")
glad if you write the code
Does not work on some domains of these sites
https://readmanga.me/odinochnyi_igrok_bagoiuzer
https://readmanga.me/pererojdenie_istochennogo__ma...
https://readmanga.me/malchik__kotoryi_pererodilsia...
Note this code works but on some are not. Still sometimes they themselves some are corrected
Error #H/D

Answer 1

or here or decompose
1) a page such and such - it has such data
BUT (!) sometimes they are NOT there
or they
are all there, this one is NEVER