Improve quota validation including a regexp which matches expected formats

[SergioBertolinSG]

Curently an admin user can enter a number probably followed by letters.
For example: "200", "15MB" or "5 GB" "20B".
Basically it's a number probably followed by letters.

Also floating point can be entered, but only in english style "2.5GB". Using a non english format for floats will lead to an old bug "4,5GB" also something like "45/0".

So the proposed enhancement by @PVince81 in #25253 is to develop a regexp to validate better this values.

[PVince81]

Thanks for the ticket, makes sense

[andypmw]

Hi guys, I am create a regex formula for this issue:
^( +)?([+-])?[\s+]?([0-9]*)(\.([0-9]+))?( +)?(b|kb|mb|gb|tb|pb|eb|zb|yb)?

I will try to write on PHP and create pull request

[PVince81]

@andypmw sounds good, thanks!

[SergioBertolinSG]

I will try to write on PHP and create pull request

I guess this validation should be done in the frontend: settings/js/users/users.js https://github.com/owncloud/core/blob/master/settings/js/users/users.js

[JKawohl]

@andypmw Did you make any progress yet?

[PVince81]

@ppaysant has added a new JS method for parsing this kind of strings, see #26789

[SamuAlfageme]

Think this is a must, since input an invalid quota (e.g. any alphanumeric string) and you'll end up with this funky quota list made with Bs:

Note that the last "Other" option has been replaced by another B.