Thanks for the help (Sorry for the long delay - I didn't get notified of 
your post).

I tried your suggestion and it works perfectly when searching for normal 
text (e.g., s.text == "Widget") but with s.text == "\8211", Pandoc throws 
the following error:

decimal escape too large near '"\5881'

Single quotes (.e.g, s.text == '\8211') gives the same error. I tried 
"\\8211" in case the backslash needs to be escaped; no error but no 
replacement occurs.

Finally, I tried the utf8.codes approach, referring to Material Icon 
codepoints doc for the value that should match, like so:

function Str (s)
  if utf8.codes(s.text) == 'e5c3' then
    return pandoc.RawInline(
      'html',
      '<i class="material-icons">apps</i>'
    )
  end
end 

No error but no replacement. 

On Saturday, 10 August 2019 12:02:40 UTC-4, Albert Krewinkel wrote:
>
> Ken Dow writes: 
>
> > My DOCX source document, which is being converted to HTML, uses some 
> Google 
> > Material fonts. What shows up in the AST are values like 
> > 
> > Str "\8211" 
> > 
> > I'd like to find and replace those to produce something like the 
> following 
> > HTML: 
> > 
> > <i class="material-icons">face</i> 
> > 
> > Is that possible and if so, how? 
>
> The way to go here is via `RawInline` elements, e.g.: 
>
>     function Str (s) 
>       if s.text == '–' then 
>         return pandoc.RawInline( 
>           'html', 
>           '<i class="material-icons">face</i>' 
>         ) 
>       end 
>     end 
>
> Note matching on an exact string would fail if the character was 
> somewhere within a word (a typical would be em-dashes). One would have 
> to use the [utf8.codes] module to manually find and replace those 
> characters in that case. 
>
> [utf8.codes](https://www.lua.org/manual/5.3/manual.html#pdf-utf8.codes) 
>
> -- 
> Albert Krewinkel 
> GPG: 8eed e3e2 e8c5 6f18 81fe  e836 388d c0b2 1f63 1124 
>

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