Posted by Bosconian on 07/19/06 06:21

"Bosconian" <nobody@nowhere.com> wrote in message
news:a9adnRNNhaRVJSDZnZ2dnUVZ_vmdnZ2d@comcast.com...
>I need a regular expression to validate characters for a given file name. I
>want to limit valid characters to the following:
>
> a-z
> A-Z
> 0-9
> underscores
> hyphens
> white spaces
>
> The file name must end with a period and a 3-character extension.
>
> I also want to prevent repeat underscores, hyphens and white spaces.
> Example: "__", "--" and " " would all be invalid.
>
> I found this example:
>
> ^[a-zA-Z0-9_\s-]+$
>
> This comes close, but it allows repeat underscores, hyphens and white
> spaces. It also uses "\s" which allows carriage returns, linefeeds, tabs,
> etc.
>
> Any help would be greatly appreciated.
>
>

I almost have it:

$pattern = "|[\wa-zA-Z0-9\-_]+\.[a-zA-Z0-9]{3}$|";

It's still allowing apostrophes though. It also still allows repeat
underscores, hyphens and white spaces. Suggestions?

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