Make \zs and \ze work in Vim search to only include substring of match

[elmewo]

Is your feature request related to a problem? Please describe.
When using the Vim search you are usually able to include only a part of the match as search result. This is not possible in VSCodeVim, yet.
Example from Practical Vim:
/\v\<\/?h\zs\d
This finds all digits in html heading tags as in

<h2>Heading number 1</h2>
<h3>Number 2 heading</h3>
<h4>Another heading</h4>

.

Describe the solution you'd like
I'd like to see the vanilla Vim regex engine behaviour here, because this is an essential feature for pattern search.

[jwmann]

\zs and \ze are literally my favourite components to vim regexp
Unfortunately I think they don't work because VSCodeVim uses regular Javascript for its regexp engine (according to #991), which iirc doesn't have the ability for \zs and \ze

[jwmann]

I found a way to do something similar to \zs and \ze
Check this out for reference: https://javascript.info/regexp-lookahead-lookbehind

[J-Fields]

Closing in favor of #3996