Add support for searching by Regex group (not by match)

[Pringlers]

Check for existing issues

• Completed

Describe the feature

Currently, when using search by Regex, Zed highlights the entire match.
It would be nice for Zed to support highlighting each group separately.

If applicable, add mockups / screenshots to help present your vision of the feature

Current behavior (search by match):

Suggested behavior (search by group):

[notpeter]

How would you suggest that this behavior be activated?
Would searching for foo(bar|baz) default to only selecting bar or baz (this differs from how VSCode and others handle this case)? If so, would I have have to use (foo(bar|baz)) to highlight the whole phrase?
What happens if you have multiple capture groups in a single expression?