Controlling Goldmark footnote rendering

AFAIK that’s a bad move because: Deprecate blackfriday #6487.

Let me simplify my suggestion:

{{ $footnoteReturnLink = (printf "${1}%s${2}" "SOMETHING") }}

{{ .Content | replaceRE "(<a (?:.*) class=\"footnote-backref\" (?:.*)>)(?:.*)(</a>)" $footnoteReturnLink | safeHTML }}

Basically I’m rendering the .Content, but using replaceRE to capture 2 groups, the portion before and after the footnote return link icon. Then I’m replacing it with “something” (but re-inserting the 2 captured groups).

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