create-next-app should let the user retry if the import alias doesn't match regex

[c-ehrlich]

It's easy to accidentally type the wrong thing when asked for the import alias (for example see a screenshot below where I typed ~ instead of ~/*. At this point the CLI exits and you have to start over.

I believe it would be a nicer experience if the CLI just told you that the input doesn't match the expected format, and then gave you another chance to enter it, as shown below.

I could implement this if it seems like a good idea.

[Nsttt]

100% agree.

[c-ehrlich]

Shout outs to the person who sniped the PR lol