您可以搜索这些不同的字符串，如下所示：

# read the text as single multiline string
$text = Get-Content -Path 'X:\Somewhere\yourfile.txt' -Raw
# create a regex string with placeholder {0}
$regex = '(?m)^& data df put king/man/{0}\s+(".+")'
# clear some variables
$connString = $connStringLog = $ConnStringSession = $null
$connString = if ($text -match ($regex -f 'ConnString')) {
    $matches[1]  # --> "Connection data 1"
}

$connStringLog = if ($text -match ($regex -f 'ConnStringLog')) {
    $matches[1]  # --> "Connection Log data"
}

$ConnStringSession = if ($text -match ($regex -f 'ConnStringSession')) {
    $matches[1]  # --> "Conn String data"
}

或者使用regex -replace：

# read the text as single multiline string
$text = Get-Content -Path 'X:\Somewhere\yourfile.txt' -Raw
# create a regex string with placeholder {0}
$regex = '(?sm).*^& data df put king/man/{0}\s+("[^"]+").*'
$connString = $text -replace ($regex -f 'ConnString'), '$1'
$connStringLog = $text -replace ($regex -f 'ConnStringLog'), '$1'
$ConnStringSession = $text -replace ($regex -f 'ConnStringSession'), '$1'

$connString         # --> "Connection data 1"
$connStringLog      # --> "Connection Log data"
$ConnStringSession  # --> "Conn String data"

P.S.如果您还需要搜索区分大小写，则在第一个代码中将-match更改为-cmatch，在第二个代码中将-replace更改为-creplace
根据您的注解，所需数据可能会或可能不会像示例行中那样被引用，然后将第一个代码块中的正则表达式创建更改为

$regex = '(?m)^& data df put king/man/{0}\s+(.+)'

基本上去掉正则表达式中的引号
作为替代，这里有另一种使用switch（逐行）的方法：

# clear some variables
$connString = $connStringLog = $ConnStringSession = $null
switch -Regex -File 'X:\Somewhere\yourfile.txt' {
    '^& data df put king/man/ConnString\s+(.+)$'        { $connString = $matches[1] }
    '^& data df put king/man/ConnStringLog\s+(.+)$'     { $connStringLog = $matches[1] }
    '^& data df put king/man/ConnStringSession\s+(.+)$' { $ConnStringSession = $matches[1] }
}

$connString         # --> Connection data 1
$connStringLog      # --> Connection Log data
$ConnStringSession  # --> Conn String data