You may know the -contains operator. Try using it to check whether an array contains a specific element:
PS > $names = dir $env:windir | Select-Object -ExpandProperty Name PS > $names -contains 'explorer.exe' True
However, -contains does not support wildcards:
PS > $names -contains 'explorer*' False
You can simply use -like instead. It works on arrays, too:
PS > $names -like 'explorer*' explorer.exe PS > @($names -like 'explorer*').Count -gt 0 True