supporting parameter wildcards

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8

EDIT:

function myfunc {
  param (
      [Parameter(ValueFromPipeline=$True)]
      [string[]]$names = ('joe','john','dave','dan')
  )

  begin {
    $list = 'joe','john','dave','dan'
    $options = [Management.Automation.WildcardOptions]'IgnoreCase,Compiled'
  }

  process {
    foreach ($name in $names) {
      if ([WildcardPattern]::ContainsWildcardCharacters($name)) {
        $wildcard = [WildcardPattern]::new($name, $options)
        foreach($item in $list) {
          if (-not $wildcard.IsMatch($item)) { continue }
          $item
        }
      } else {
        $name
      } 
    } 
  } 
} 

PS /Users/js> myfunc j*,d*                                                                       
joe
john
dave
dan

PS /Users/js> echo j*,d* | myfunc                                                                
joe
john
dave
dan   

PS /Users/js> myfunc fred,barney                                                                 
fred
barney

PS /Users/js> $options                                                                           
Compiled, IgnoreCase