Family Historian User Group

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		local strUTF8 = "([%z\1-\127\194-\244][\128-\191]*)"			-- Cater for Lua 5.1 %z or Lua 5.3 \0
		if fhGetAppVersion() > 6 then
			strUTF8 = "([\0-\127\194-\244][\128-\191]*)"
		end

		-- Supply character substring of UTF-8 text --
		function substring(strTxt,i,j)
			local strSub = ""
			j = j or -1
			if j < 0 then j = j + length(strTxt) + 1 end
			if i < 0 then i = i + length(strTxt) + 1 end
			for strChr in string.gmatch(strTxt or "",strUTF8) do
				if j <= 0 then break end
				j = j - 1
				i = i - 1
				if i <= 0 then strSub = strSub..strChr end
			end
			return strSub
		end -- function substring

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	-- Hide % escape/capture symbols in replacement so they are inert
	function fh.inert(strTxt)
		strTxt = tostring(strTxt or ""):gsub("%%","%%%%")					-- Hide all % symbols
		return strTxt
	end -- function inert