[Solved] Unable to get data between multiple keyword using powershell

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The problem with your script is here :

Where-Object {$_ -match '(?is)(?<=\bNAME1\b).*?(?=\bNAME2\b|\bNAME3\b|NAME4|NAME5|NAME6\b)'}
This doesn’t mean “keep the matches”, but “if there is a match, keep the entire string”.

Here is another way to do what you want :

$text = Get-Content .\withoutStar.txt
$regex = "(?is)(?<=\bNAME1\b).*?(?=\bNAME[2-6]\b)"
Set-Content .\AllfunctionGroup.txt -Value ""
(Select-String -Pattern $regex -Input $text -AllMatches).Matches | ForEach {
    Add-Content .\AllfunctionGroup.txt $_.Value
}

Edit : I simplified a bit your regex

solved Unable to get data between multiple keyword using powershell