I had put this question into an old thread, so nobody read it. Please don't mind me repeating it here:
"I have some ebooks where, in the current of the text, appear page numbers (probably referring to the original printed version), sometimes even with hyperlink referring to the original TOC. I would like to delete them, but have no clue on regex matters. In one particular book, the numbers appear in squared brackets, such as [Pg 4]. Those numbers have up to three digits. The tags are like this: <span class="pagenum"><a class="pcalibre pcalibre1" id="Page_4">[Pg 4]</a></span>. Is there a way of removing them by one single regex command in Sigil or Calibre?"
By the way: It would be very nice, if there were a feature in Sigil to do such operations without necessity of beeing a Regex crack (I tried a lot of things, but nothing that worked only approximately). No idea if there are technical possibilities, but I think many users would be happy to be able to manipulate theํr books in an easier way.