Using PowerShell to remove lines from a text file if it contains a string

Question

I am trying to remove all the lines from a text file that contains a partial string using the below PowerShell code    Get-Content C  new temp   txt   Select-String -pattern  H 159  -notmatch   Out-File C  new newfile txt   The actual string is H 159 28-05-2005 508 xxx  it repeats in the file multiple times  and I am trying to match only the first part as specified above  Is that correct  Currently I am getting empty as output   Am I missing something

User · Accepted Answer

Escape the   character using a backtick  get-content c  new temp   txt   select-string -pattern  H  159  -notmatch   Out-File c  new newfile txt

User · Answer

Suppose you want to write that in the same file  you can do as follows   Set-Content -Path  C  temp Newtext txt  -Value  get-content -Path  c  Temp Newtext txt    Select-String -Pattern  H  159  -NotMatch

User · Answer

The pipe character   has a special meaning in regular expressions  a b means  match either a or b   If you want to match a literal   character  you need to escape it         Select-String -Pattern  H  159  -NotMatch

[powershell] Using PowerShell to remove lines from a text file if it contains a string

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