fix(hyperlinks): hyperlinks can contain parentheses

[dtroelofsprins]

Is your feature request related to a problem? Please describe.
Currently hyperlinks including parentheses are indicated as invalid, although these are valid hyperlink, f.e. https://www.thelancet.com/journals/lancet/article/PIIS0140-6736(07)61086-1/fulltext

Work-around to store it is by replacing the "(" and ")" by %28 and %29

Describe the solution you'd like
As a user I want to be able to save hyperlinks including parentheses without having to encode them

Describe alternatives you've considered
Keep the existing work-around

Additional context
Add any other context or screenshots about the feature request here.

[esthervanenckevort]

Acceptable to translate on the fly to percentage encoding

[chinook25]

I think the best solution is to update the regex that does the check to allow for '(' and ')' (maybe after the first '/'?).