ConvertFrom-WildcardPattern.ps1

function ConvertFrom-WildcardPattern {
  param(
    [Parameter(Mandatory, ValueFromPipeline)]
    [WildcardPattern]$InputObject
  )

  begin {
    $pctrProp = [WildcardPattern].
                  GetMember('PatternConvertedToRegex', [Reflection.BindingFlags]'NonPublic, Instance')
  }

  process {
    return $pctrProp.GetMethod.Invoke($InputObject, @())
  }
}