Powershell to use regx to find character position - regex

Question

I want to add " after third comma and " before fifth comma. How can this can be done in powershell ?
My idea is to use regex function to find the location of the third and fifth comma then add " to them by
$s.Insert(4,'-') **In case reg return position 4
example data
04642583,3,HC Mobile,O213,Inc,SIS Services,KR,Non Payroll Relevant,KR50
Output
04642583,3,HC Mobile,"O213,Inc",SIS Services,KR,Non Payroll Relevant,KR50
This is code I tried, but it failed by 'An empty pipe element is not allowed' How to fix it
$source = "D:\Output\MoreComma.csv"
$FinalFile = "D:\Output\MoreComma_Corrected.csv"
$content = Get-Content $source
foreach ($line in $content)
{
$items = $line.split(',');
$items[3] = '"'+$items[3]
$items[4] = $items[4]+'"';
$items -join ','
} | Set-Content $FinalFile

Answer 1

If you know the format (e.g you know that it's always in this comma-separated fashion); and your're only trying to achieve this; you can simply just split the line, add the quotes and join the line again.
Example:
$data = "04642583,3,HC Mobile,O213,Inc,SIS Services,KR,Non Payroll Relevant,KR50";
$items = $data.split(',');
$items[3] = '"'+$items[3]
$items[4] = $items[4]+'"';
$items -join ','
This will produce the line:
04642583,3,HC Mobile,"O213,Inc",SIS Services,KR,Non Payroll Relevant,KR50
Given you've stored this in a CSV- file:
$file = "C:\tmp\test.csv";
$lines = (get-content $file);
$newLines=($lines|foreach-object {
$items = $_.split(',');
$items[3] = '"'+$items[3]
$items[4] = $items[4]+'"';
$items -join ','
})
You can then output the result in a new file if you want
$newLines|Set-content C:\tmp\test2.csv
This will "mess" up your CSV-format file though (as it will considered to "merge the columns"), but I'm guessing this is what you're trying to achieve?