Negative lookbehind with optional suffix without duplication

I am writing regex that finds all stings with these conditions:

• not starting with foo/ or bar/ or with foo (end of line) or bar (end of line)
• not ending with /baz or /qux and not ending with /baz/ or /qux/

Examples that should not match:

foo
bar/nomatch
/nomatch/baz
nomatch/baz/

Examples should match:

foomatch
bazmatch
/baz/match

The regex I came up with combines a negative lookahead and a negative lookbehind:

/(?!(foo|bar)(\/|$)).*(?<!(\/)(baz|qux)(\/|$))/gm

My problem: the negative lookbehind needs to have a fixed width (ie: I cannot use (\/|$) to check for an optional slash at the end of the string). I could solve this by creating the following rule: /(?!(foo|bar)(\/|$)).*(?<!(\/)(baz|qux))(?<!(\/)(baz|qux)\/)/gm, which uses baz and qux twice. Is there another way to solve this without this duplication?

For an interactive example, see: https://regex101.com/r/bIosD0/1

You can drop the lookbehind and either add another negative lookahead or use one and alternate inside between different conditions. Assuming you also want to disallow qux and baz alone.

^(?!(?:foo|bar)(?:\/|$)|(?:.*\/)?(?:baz|qux)\/?$).+

At ^ start the (?! negative lookahead ) contains two conditions:

1. (?:foo|bar)(?:\/|$) what you got already, e.g. no foo/..., foo (same for bar)
2. |(?:.*\/)?(?:baz|qux)\/?$ OR no baz, baz/ preceded by an optional .*\/ (any amount of any characters followed by a slash) to further disallow such as .../baz/, .../baz at $ end.

See this demo at regex101

I used (?: non-capturing groups ) for alternations because nothing needs to be captured.