Find line starting with specific word and then replace string between two words in that line

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I have a Csv file which have huge data. I want a PowerShell script which will search for a line starting with number 19999, if found then in that line replace whatever is between IISST: and Progress with word Result.

Below is example of data.

1 ABC Test data Test data IISST: I am OK with this Progress some more data
1299 Someone needs this Test data IISST: I am OK with this Progress some more data
19999 ABC Test data Test data IISST: I want to replace this text with Result word Progress some more data
20000 ABC Test data Test data IISST: I am OK with this Progress some more data
79837 Someone needs this Test data IISST: I am OK with this Progress some more data

I have wrote below code after 3 days of struggle. and this code is removing all lines from file and adding only one line which I updated.

$search= [regex] "^19999"
$FullContentofLine= Get-Content "O:\Temp\test.csv" | select-string $search
$linenumber=$FullContentofLine.LineNumber
$linenumber
$fullContentofFile=Get-Content "O:\Temp\test.csv"
$contentUpdate = $fullContentofFile[$linenumber-1] -replace [regex] "IISST:(.*?)Progress","IISST: Result Progress" 
#$contentUpdate
Set-Content "O:\Temp\test.csv" $contentUpdate
powershell
1 Answers

For this task I would recommend you the use of a switch with the -File parameter to read your file and the -Wildcard parameter to match the lines starting with 19999 and containing IISST: and Progress.

For replacement of the line, there is no need to create a Regex instance, the -replace operator already understands regular expressions.

For the regex pattern being used, you can check https://regex101.com/r/adMCPg/1 for description.

$newContent = switch -Wildcard -File 'O:\Temp\test.csv' {
    # look for lines starting with `19999` and containing `IISST:` and `Progress`
    '19999*IISST:*Progress*' {
        # if a line was matched,
        # replace everything between `IISST:` and `Progress` with ` Result `
        $_ -replace '(?<=IISST:).+(?=Progress)', ' Result '
        # and go to next line
        continue
    }
    # if the line was NOT matched, output it as-is
    Default { $_ }
}
# replace the file with the new content
$newContent | Set-Content 'O:\Temp\test.csv'
user_153395440
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