nokogiri_match.rb

# Pattern to match a link: <a/>  
node in { name: 'a' }

# Pattern for a link with a class: <a class="foo"/>
node in { name: 'a', class: 'foo' }

# Pattern to select that link: <a class="foo">{.}</a>
node => { name: 'a', class: 'foo', children: }

# Pattern to select the target URL: <a class="foo" href="{.}"/>
node => { name: 'a', href: }

# Pattern for multiple links: <a class="foo" href="{.}"/>+
nodes => [*, { name: 'a', href: => link_one }, { name: 'a', href: => link_two } *]