Stylus preprocessor has problems with "?" quantifier in regexp

[Atexor]

Hello,
I am using Stylus addon for Firefox to implement css for style (for Chrome issue appears too).
When I changed preprocessor to stylus I got issues with my regex. Author of same-named addon confirmed that it is related with preprocessor.

To reproduce:

Stylus has issues with ? quantifiers. Create any userCSS style on addon. Use regex with ? quantifier, e.g.:

@-moz-document regexp("https:\/\/(www\.)?((((console.)?)developers)|(explorer\.apis))\.google\.(com|([a-z]{2}))(\.[a-z]{2})?\/.*") {/*...*/}

Current behavior:

Regex not working, unable to save style.

Expected behavior:

On regex101 no errors found and the same should be with Stylus.

Environment information:

• stylus version: 0.60.0 (not sure of version used in addon).
• nodejs version: n/a

[iChenLei]

maybe you can use @css as a workaround.

[Atexor]

It is not supported.

edit: my bad, wrong usage. Looks working at first glimpse. Will test.

[Atexor]

Okay, checked by creating new style and by copy and paste one-few sections. Regex issues disappeared despite styles were exactly the same (compared with Notepad++ compare plugin) in the end (when I replaced meta-data in both styles to default to exclude issues with it). I don't know why it happens, some underhood issues?

I had also few parsing issues, but resolved by putting them into @css {} workaround as you said. Almost all of them were related to semicolons in attributes in #2842.

[Atexor]

I found another issue related with preprocessor related with attributes and comma. Please see my issue reported there. Escaping with \ helps but it should be fixed on preprocessor level.