Multi-rec dir

function rec($p){
    if($p[-1] -eq '/' -or $p[-1] -eq '\'){ $p += '**' }

    if($p.indexOf('**') -gt -1){
        dir -r $p.substring(0,$p.indexOf('**')) |
            ?{ !$_.PSIsContainer -and $_.FullName -like $p} | %{$_.FullName}
    } else {
        dir $p | ?{ !$_.PSIsContainer } | %{ $_.FullName }
    }
}

rec 'C:\test\**\sub2\*.sml'
<#
    C:\test\sub0\sub3\sub2\set.sml
    C:\test\sub0\sub3\sub2\vector3.sml
    C:\test\sub1\sub2\set.sml
    C:\test\sub1\sub2\vector3.sml
#>