[Rails] gsub appearing in xml

I'm using the 'builder' gem. I create an XML builder, add a sequence of
tags with inner text, then escape the HTML, then save the object.

Problem: The following gsub tag is appearing in my XML that I didn't put
there.
<gsub &="&amp;amp;" "="&amp;quot;" <="&amp;lt;"
>="&amp;gt;">(?-mix:[&amp;\"&lt;&gt;])</gsub>

Can someone explain where this tag is coming from?

builder = Builder::XmlMarkup.new
builder.scrapetree(@topic.content)
...
...
...
@scrapetree = Scrapetree.new
@scrapetree.content = CGI::escapeHTML(builder)
@scrapetree.save

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