use variable on regex

Hello,

I try to use variable $_.fg_name  on regex but the result is []


$file = "C:\test\mv_ddl.sql"
$_.fg_name = "Primary"



(Get-Content $file) | ForEach-Object {$_ -replace [regex]::Escape("ALLOW_PAGE_LOCKS  = ON) ON [PRIMARY]"), "ALLOW_PAGE_LOCKS  = ON) ON \[$($_.fg_name))\]" -replace [regex]::Escape(") ON [PRIMARY]"), ") ON \[$($_.fg_name))\] TEXTIMAGE_ON [LOB]"} | Set-Content $file

How can I resolve, please?

Thanks

Regards
bibi92Asked:
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oBdAConnect With a Mentor Commented:
On closer inspection, you had a closing parenthesis too many, and since the patterns will be escaped by [regex]::Escape, you don't need to escape the square brackets.
$file = "C:\test\mv_ddl.sql"
$fg_name = "Primary"

(Get-Content $file) | ForEach-Object {$_ -replace [regex]::Escape("ALLOW_PAGE_LOCKS  = ON) ON [PRIMARY]"), "ALLOW_PAGE_LOCKS  = ON) ON [$($fg_name)]" -replace [regex]::Escape(") ON [PRIMARY]"), ") ON [$($fg_name)] TEXTIMAGE_ON [LOB]"} | Set-Content $file 

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oBdACommented:
$_ is the loop variable inside the ForEach, which is the string from the input file currently being processed.
Just use a regular variable (and please put code inside code style tags, see the buttons over the Edit field).
$file = "C:\test\mv_ddl.sql"
$fg_name = "Primary"

(Get-Content $file) | ForEach-Object {$_ -replace [regex]::Escape("ALLOW_PAGE_LOCKS  = ON) ON [PRIMARY]"), "ALLOW_PAGE_LOCKS  = ON) ON \[$($fg_name))\]" -replace [regex]::Escape(") ON [PRIMARY]"), ") ON \[$($fg_name))\] TEXTIMAGE_ON [LOB]"} | Set-Content $file

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Dustin SaundersDirector of OperationsCommented:
You need to get that variable another way, $_ is referring to the object piped in.  For example:

1,2,3 | %{ write-host $_ } 

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So you need to reference the object which contains the property you want to use.  What object contains fg_name and can you post code where you are getting that object?
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bibi92Author Commented:
I test Obda solution the result for the variable is  \[)\].

Thanks
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bibi92Author Commented:
Thanks a lot
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bibi92Author Commented:
thanks
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