Get-ChildItem + Regex matching

I've got a folder containing many temp files, and i'm trying list files that have names between 1 and 4 hexadecimal characters, with ".tmp" as the extension.

When i run the following, i can match filenames of exactly 4 characters:

Get-ChildItem -Path C:\temp\files | where-object {$_.Name -match '^[a-f0-9]{4}?.tmp$'}

And this gives me all that are 3 characters:

Get-ChildItem -Path C:\temp\files | where-object {$_.Name -match '^[a-f0-9]{3}?.tmp$'}

According to http://ss64.com/ps/syntax-regex.html, I should be able to replace the number inside the curly braces with a range of the number of matches (ex. {1-4}) but that returns 0 results. What am I missing?
Chris ValentinoSystems EngineerAsked:
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oBdACommented:
Read your link again: the range is specified with a comma, not a minus:
Get-ChildItem -Path C:\temp\files | where-object {$_.Name -match '^[a-f0-9]{1,4}?.tmp$'}

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Chris ValentinoSystems EngineerAuthor Commented:
Good catch, thanks!
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