Help for this page

Select Code to Download

Select or download this

$package !~ /^\w[\w\:\']*\w?\z/
  || $package !~ /\w\z/
  || $package =~ /:/ && $package !~ /::/
  || $package =~ /\w:\w/
  || $package =~ /:::/

Select or download this
```
/^[A-Za-z0-9_]+(::[A-Za-z0-9_]+)*$/
```