Get dynamic download url using RegEx

src/helpers/chocolateyInstaller.psm1

@@ -9,4 +9,4 @@ Resolve-Path $helpersPath\functions\*.ps1 |
     ? { -not ($_.ProviderPath.Contains(".Tests.")) } |
     % { . $_.ProviderPath }
 
-Export-ModuleMember -Function Start-ChocolateyProcessAsAdmin, Install-ChocolateyPackage, Uninstall-ChocolateyPackage, Install-ChocolateyZipPackage, Install-ChocolateyPowershellCommand, Get-ChocolateyWebFile, Install-ChocolateyInstallPackage, Get-ChocolateyUnzip, Write-ChocolateySuccess, Write-ChocolateyFailure, Install-ChocolateyPath, Install-ChocolateyDesktopLink, Install-ChocolateyPinnedTaskBarItem, Install-ChocolateyExplorerMenuItem, Install-ChocolateyFileAssociation, Install-ChocolateyEnvironmentVariable, Write-Host, Write-Debug, Write-Error, Update-SessionEnvironment, Install-ChocolateyVsixPackage
+Export-ModuleMember -Function Start-ChocolateyProcessAsAdmin, Install-ChocolateyPackage, Uninstall-ChocolateyPackage, Install-ChocolateyZipPackage, Install-ChocolateyPowershellCommand, Get-ChocolateyWebFile, Install-ChocolateyInstallPackage, Get-ChocolateyUnzip, Get-FilenameFromRegex, Write-ChocolateySuccess, Write-ChocolateyFailure, Install-ChocolateyPath, Install-ChocolateyDesktopLink, Install-ChocolateyPinnedTaskBarItem, Install-ChocolateyExplorerMenuItem, Install-ChocolateyFileAssociation, Install-ChocolateyEnvironmentVariable, Write-Host, Write-Debug, Write-Error, Update-SessionEnvironment, Install-ChocolateyVsixPackage

src/helpers/functions/Get-FilenameFromRegex.ps1

@@ -0,0 +1,45 @@
+# Some files have a changing element/hash in the download path, making an automated download harder.
+# This file gets the correct download url from a download page with a regular expression.
+# Good for e.g. Foobar2000, Rename Master, etc
+#
+# Usage: Get-FilenameFromRegex download_page find replace
+# Examples:
+# Get-FilenameFromRegex "http://www.joejoesoft.com/vcms/hot/userupload/8/files/rmv303.zip" '/cms/file.php\?f=userupload/8/files/rmv303.zip&c=([\w\d]+)' 'http://www.joejoesoft.com/sim/$1/userupload/8/files/rmv303.zip'
+#
+# Remember to escape regex characters, like the question mark in the querystring
+
+function Get-FilenameFromRegex {
+	param(
+		[string]$source_url, 
+		[string]$find,
+		[string]$replace
+	)
+
+	try {
+
+		## Example # $source_url = "http://www.joejoesoft.com/vcms/hot/userupload/8/files/rmv303.zip"
+		## Example # $find = '/cms/file.php\?f=userupload/8/files/rmv303.zip&c=([\w\d]+)'
+		## Example # $replace = 'http://www.joejoesoft.com/sim/$1/userupload/8/files/rmv303.zip'		
+
+		# Download and open download page
+		$tempfile = "chocolatey_temp_download.html"
+		$wc = new-object system.net.webclient
+		$wc.UseDefaultCredentials = $true
+		$wc.downloadfile($source_url, $tempfile)
+		$source = Get-Content $tempfile
+
+		$nothing = ''+$source -cmatch $find # Get the matches, prevent output
+		# Replace Match-references with previous matches: $1 $2 -> $matches[1] $matches[2]
+		#$download_url = $replace -creplace "\$`(\d+)",$matches[$1]
+		# This one is not working :(
+		# I have a temporary fix that only allows ONE match. However, in most cases we only need one match.
+		$download_url = $replace -creplace "\$`(\d+)",$matches[1]
+
+		return $download_url
+
+	} catch {
+		$errorMessage = "Could not get Regex from download page."
+		Write-Error $errorMessage
+		throw $errorMessage
+  }
+}