Reading INI files with dashes in the section name

I am trying to read an INI file from a web site. Within that INI file are sections that have dashes in them. I need to be able to read several sections so I can locate specific files to download referenced within the INI files. I found a script for parsing INI files, but when I run it, the script fails to handle the sections that have dashes. Any ideas on how I can work around the issue?

$Web = New-Object System.Net.WebClient
Function Get-INIContent ($ContentList){
    $INI = @()
    Switch -regex ($contentList)
        {"^\[(.+)\]" 
            {
            [string]$Section = $Matches[1]
            $INI[$Section] = @{}
            $CommentCount = 0
            }
        }

}

$ContentList = $Web.Downloadstring("http://download.nai.com/PRODUCTS/COMMONUPDATER/avvdat.ini")
Get-INIContent $contentlist

What I was hoping to do was search through the INI until I found the sections I want, and then read the fields for that section so I know what to download.  I won't be pulling all of the files, so I need to find a way to search for the sections I am looking for then read all of the lines for that section and process them.