Ooops. Terribly sorry, I didn't specify that what I want is to make it :
> Front of Book > Conflicts of interest: none declared
Which what happens when I manually edit using the h1 tag on the Book View.
And <div id="printheader_crumbtrail">\s+(.*?)\s+</div>
doesn't seem to work.
Also I can't convert the CHM to epub due to a broken TOC that omits one main chapter (and I've tried Calibre and a few other options), so building it through Sigil seems a much a straightforward job (there's also a weird problem of loss of character sets when I try rebuilding the CHM using WinCHM so I'd rather preserve the decompiled files that retain their appearance in Sigil).