limit syntax match to not match strings starting with dashes

Hello vimmers,

I'm using the PS1.vim syntax file while writing Powershell scripts.

It has a line like this:

syn match ps1Cmdlet /\w\+-\w\+/

which should (and does) match command names like Write-Debug, Get-Date, etc.

However, it also incorrectly matches command line arguments like

mysqldump --single-transaction

where "single-transaction" is highlighted with the ps1Cmdlet colors.

How can I change this so that it matches the verb-noun syntax that Powershell uses but doesn't match the dashed arguments?

Thanks,

Dan

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