When use use a &nnnn; character in Sigil, it get transformed into the actual unicode character so you no longer can search for the string "&nnn;". What I do to work around this is to copy the character I want to search for into the search popup in order to build my search expression.
The regular expression search use Qt’s QRegExp. There must be a syntax in there to specify unicode character using their number but I don't know the syntax to do this.
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