在CSV文件中分割字符串

Question

I have the following data in a CSV file

"Name","SourceIP","DestinationIP"
"Sep  1 03:55:57 mmt-5","172.16.48.158","22.22.22.22"
"Sep  1 03:55:57 mmt-5","172.16.48.158","22.22.22.22"
"Sep  1 03:55:57 mmt-5","172.16.48.158","22.22.22.22"
"Sep  1 03:55:57 mmt-5","172.16.48.158","22.22.22.22"

I need to split the Name column in to 3 more columns. Date , Time and Name . Like the following

"Date","Time","Name","SourceIP","DestinationIP"
"Sep  1","03:55:57","mmt-5","172.16.48.158","22.22.22.22"
"Sep  1","03:55:57","mmt-5","172.16.48.158","22.22.22.22"
"Sep  1","03:55:57","mmt-5","172.16.48.158","22.22.22.22"
"Sep  1","03:55:57","mmt-5","172.16.48.158","22.22.22.22"

A bit lost on how to accomplish. I have tried this to replace the 14th character with a comma but no luck.

$test = import-csv C-sample.csv

$test | foreach-object {
    $_.Name = $_.Name.Replace(14, ",")
}

$test | export-csv D-sample.csv -notype

Any help?

Answer 1

I would parse the string using a regex and create a new PSCustomObject to export it back:

$test = import-csv C-sample.csv
$regex = '(?<Date>\w+\s+\d{1,2})\s+(?<Time>\d{2}:\d{2}:\d{2})\s+(?<Name>.*)'

$test | foreach-object {
    $regMatch = [regex]::Match($_.Name, $regex)
    [PSCustomObject]@{
        Date = $regMatch.Groups['Date'].Value
        Time = $regMatch.Groups['Time'].Value
        Name = $regMatch.Groups['Name'].Value
        SourceIP = $_.SourceIP
        DestinationIP = $_.DestinationIP
    }
} | export-csv D-sample.csv -notype

---

Regex:

(?<Date>\w+\s+\d{1,2})\s+(?<Time>\d{2}:\d{2}:\d{2})\s+(?<Name>.*)

---

Output:

"Date","Time","Name","SourceIP","DestinationIP"
"Sep  1","03:55:57","mmt-5","172.16.48.158","22.22.22.22"
"Sep  1","03:55:57","mmt-5","172.16.48.158","22.22.22.22"
"Sep  1","03:55:57","mmt-5","172.16.48.158","22.22.22.22"
"Sep  1","03:55:57","mmt-5","172.16.48.158","22.22.22.22"

---

Edit:

Since you are using PowerShell 2, you can't use the PsCustomObject cast on a hashtable so use this instead:

$test = import-csv C-sample.csv
$regex = '(?<Date>\w+\s+\d{1,2})\s+(?<Time>\d{2}:\d{2}:\d{2})\s+(?<Name>.*)'

$test | foreach-object {
    $regMatch = [regex]::Match($_.Name, $regex)

       $object = New-Object PSObject
       Add-Member -InputObject $object -memberType NoteProperty -Name Date -Value  $regMatch.Groups['Date'].Value
       Add-Member -InputObject $object -memberType NoteProperty -Name Time -Value $regMatch.Groups['Time'].Value
       Add-Member -InputObject $object -memberType NoteProperty -Name Name -Value $regMatch.Groups['Name'].Value
       Add-Member -InputObject $object -memberType NoteProperty -Name SourceIP -Value $_.SourceIP
       Add-Member -InputObject $object -memberType NoteProperty -Name DestinationIP -Value $_.DestinationIP
       $object
} | export-csv D-sample.csv -notype