Strip last "-" if it exsits in a Hugo Shortcode using replaceRE

Question

I'm using a shortcode in Hugo to wrap a heading in a link on a .md page so I can use anchor links on the same page.

The shortcode converts the heading to lower case and converts spaces and other characters to dashes. The problem is that the shortcode will leave a trailing "-" on the heading if the heading has a question mark or other character at the end. How can I strip the ending dash - if it exists?

The shortcode link-heading.html :

{{ $id := .Get 0 | lower | replaceRE "[^0-9a-z]" "-" | replaceRE "-+" "-" -}}
<a href="#{{ $id }}">
  <h2>{{ .Get 0 }}</h2>
</a>

The shortcode usage in .md file:

{{< link-heading "This is a String with a Trailing?" >}}

outputs

<a href="#this-is-a-heading-with-a-trailing-">
<h2>This is a Heading with a Trailing?</h2>
</a>

while using markdown for the anchor link

## This is a String with a Trailing?

outputs

<h2 id="this-is-a-heading-with-a-trailing">This is a heading with a Trailing?</h5>

The problem is the - at the end of the shortcode output. How can I strip that last - if it exists using replaceRE in the shortcode link-heading.html above?

Answer 1

I think I may be missing something here but if you just want to grab the - at the end of the string or if it's preceded by a ? you can do something like:

• -(?:\?|$)