Intellisense works on commands that don't exist

[MisinformedDNA]

System Details

• posh-git version/path: 1.0.0
• PowerShell version: 7.2.3
• git version 2.39.0.windows.2
• OS: Microsoft Windows NT 10.0.19042.0

Issue Description

I noticed that I can add any amount of text after a command and the autocomplete still works:

git branchjfhsdfhslfsd<tab>

This is because the IntelliSense doesn't require a space after the command:

"^branch.* (?<branch>\S*)$"

Unless I'm missing something, I would think it should be more like this

"^branch (.* )?(?<branch>\S*)$"