In other words, there can be no other occurrence of the pattern between the end of the match and the second pattern. This needs to be implemented in a single regular expression.

In my specific case I have a page of HTML and need to extract all the content between

<w-block-content><span><div>

and

</div></span></w-block-content>

where

• the elements might have attributes
• the HTML might be formatted or not - there might be extra white space and newlines
• there may be other content between any of the above tags, including inner div elements within the above outer div. But you can assume each <w-block-content> element
  • contains ONLY ONE direct child <span> child (i.e. it may contain other non-span children)
    • which contains ONLY ONE direct <div> child
      • which wraps the content that must be extracted