Vista - $_.contains versus -contains

$_.contains versus -contains...

Should these behave differently?

175# $test=@"
>> test 123
>> "@
>>
176# $test -contains 123
False
177# $test -contains "123"
False
178# $test|foreach-object{$_.contains("123")}
True
179# $test -contains "test 123"
True

(I seem to remember that I think it was also different behaviour between
$_.replace and -replace.)

Marco

I think $_.contains('x') is similar to $_ -match 'x' or $_ -like "*x*"

$_ -contains 'x' checks 'x' against a collection of elements in $_ to match.

"test 123".contains('1')

"test 123" -match 1

"test 123", "456", 768 -contains 456


--
Kiron

"Marco Shaw" <marco.shaw@_NO_SPAM_gmail.com> wrote in message
news:Or3eJcKwHHA.3508@TK2MSFTNGP03.phx.gbl...
> $_.contains versus -contains...
>
> Should these behave differently?
>
> 175# $test=@"
> >> test 123
> >> "@
> >>
> 176# $test -contains 123
> False
> 177# $test -contains "123"
> False
> 178# $test|foreach-object{$_.contains("123")}
> True
> 179# $test -contains "test 123"
> True

Yes they are pretty different and it is reasonable that they behave
differently. $_.contains is really just System.String.Contains which was
designed by the .NET Framework BCL team. Those folks have a much more
strict definition of how String.Contains works which you would expect from a
lower level framework type. -contains however is a PowerShell operator and
PowerShell goes to great lengths to just make the operator work as you would
expect it to in the face of different data types and dimensionality (scalar
vs array).

--
Keith