Use named capture groups for normalization regexes
Use named capture groups for normalization regexes

This will make the regexes a bit easier to understand and less likely to
break as we use them in new places.

lencioni/import-js,Galooshi/import-js,trotzig/import-js,lencioni/import-js,lencioni/import-js,trotzig/import-js,trotzig/import-js