`@plugi` and `@impor` are supported

[edhgoose]

We discovered that the regex used for import and plugin have a ? at the end of them, which means @plugi and @impor work as well as @plugin and @import.

These are defined here: https://github.com/less/less.js/blob/master/packages/less/src/less/parser/parser.js#L1687 and https://github.com/less/less.js/blob/master/packages/less/src/less/parser/parser.js#L1847.

This doesn't look like an intentional decision and more of a regex mistake. See here for example inputs: https://regex101.com/r/NUw7E2/2

Is this correct?

[iChenLei]

Thanks for report this issue.