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Description

The example for the link-external-filter config is a bit confusing:

For example
^(?:http:|https:)\/\/www\.quarto\.org\/custom
will treat links that start with http://www.quarto.org as internal links

what is that custom doing in the example regex? Is that part of the regex (meaning that it has to be part of the link to be considered internal)? Or is that a special syntax for something?