{{- /* Font Awesome */ -}}
{{- /* :(far fa-circle): -> <i class="far fa-circle fa-fw"></i> */ -}}
{{- $REin := `:\(([\w- ]+?)\):` -}}
{{- $REout := `<i class="$1 fa-fw"></i>` -}}
{{- $content := replaceRE $REin $REout . -}}

{{- /* Ruby */ -}}
{{- /* [EN]^(English) -> <strong><ruby>EN<rt>English</rt></ruby></strong> */ -}}
{{- $REin = `\[(.+?)\]\^\((.+?)\)` -}}
{{- $REout = `<strong><ruby>$1<rt>$2</rt></ruby></strong>` -}}
{{- $content = replaceRE $REin $REout $content -}}

{{- /* Checkbox */ -}}
{{- $REin = `<input disabled="" type="checkbox">` -}}
{{- $REout = `<i class="far fa-check-square fa-fw"></i>` -}}
{{- $content = replaceRE $REin $REout $content -}}

{{- /* Checkbox checked */ -}}
{{- $REin = `<input checked="" disabled="" type="checkbox">` -}}
{{- $REout = `<i class="far fa-square fa-fw"></i>` -}}
{{- $content = replaceRE $REin $REout $content -}}

{{- /* Fix <sup>[return]</sup> */ -}}
{{- $REin = `<sup>\[return\]</sup>` -}}
{{- $REout = `↩︎` -}}
{{- $content = replaceRE $REin $REout $content -}}

{{- $content | safeHTML -}}