installation issue when hyphen added in app name

[rameezrami]

🐞 Bug report

Command (mark with an x)

- [x ] new
- [ ] build
- [ ] serve
- [ ] test
- [ ] e2e
- [ ] generate
- [ ] add
- [ ] update
- [ ] lint
- [ ] xi18n
- [ ] run
- [ ] config
- [ ] help
- [ ] version
- [ ] doc

Is this a regression?

Yes, in previous versions

Description

A clear and concise description of the problem...

I cant create apps with hyphen included in the name.. please check the attached gif to get a clear understanding.

🔬 Minimal Reproduction

🔥 Exception or Error

ng new angular-7-realworld-starter 

does not works but

ng new dsadsd

works

Versions

ubuntu 18

$ node --version
v10.15.3

$ npm --version
6.4.1

$ ng --version

     _                      _                 ____ _     ___
    / \   _ __   __ _ _   _| | __ _ _ __     / ___| |   |_ _|
   / △ \ | '_ \ / _` | | | | |/ _` | '__|   | |   | |    | |
  / ___ \| | | | (_| | |_| | | (_| | |      | |___| |___ | |
 /_/   \_\_| |_|\__, |\__,_|_|\__,_|_|       \____|_____|___|
                |___/
    

Angular CLI: 7.3.9
Node: 10.15.3
OS: linux x64
Angular: 
... 

Package                      Version
------------------------------------------------------
@angular-devkit/architect    0.13.9
@angular-devkit/core         7.3.9
@angular-devkit/schematics   7.3.9
@schematics/angular          7.3.9
@schematics/update           0.13.9
rxjs                         6.3.3
typescript                   3.2.4

[alan-agius4]

Hi, the problem is not the hyphen but the number.

This was not supported in version 7, however it is now supported in version 8.

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