This works:
#Surround all of the text (NOT attribute value) merge fields with <span>
tags for ease of manipulation later
doc = Nokogiri::HTML.parse(html)
nodes = doc.xpath("//text()[contains(.,'MERGE')]")
nodes.each do |node|
text = node.text.dup
if md = text.match(/.{2}MERGE(\d+).{2}/)
start_index = text.index(md[0])
end_index = start_index + md[0].length
node = node.replace(text[0..start_index - 1])[0]
node.after("<span
id='merge_#{md[1]}'>#{md[0]}</span>#{text[end_index..-1]}")
end
end
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