Can't replace div using regex

Question

I have the following code from lines 6-20

            <div>
                1
            </div>
            <div>
                2
            </div>
            <div>
                3
            </div>
            <div>
                4
            </div>
            <div>
                5
            </div>

I want to replace all <div> {anything here} </div> with none.

I tried the following

1. :%s/<div>\W+.\W+div>//
2. :6,20s/<div>\W+.\W+div>//
3. :6,20s/<div>\W+.\W+div>/\0/
4. :%s/<div>\W+.\W+div>/\0/

Nothing works. It says Pattern not found

But when I search with this /<div>\W+.\W+div>

It shows that there are 5 matches

How to achieve this substitution?

Answer 1

I'm not entirely sure what's wrong with the regex, though filbranden has some thoughts in the comments.

To solve the issue, though, I would do something a bit different: :global/<div>/normal! dat (delete the tag on the lines with an opening div tag).