PowerShell Insert into array

Question

We're creating a big script and need to generate some HTML-code. This all works fine and I've collected all the info I need in the array $HTMLcode.

I'm still a bit of a noob in array/string manipulation, so I was wondering if its possible to insert a line of text above every line in the array HTMLcode that starts with the text ERROR?

$HTMLcode=@()
$HTMLcode += "ERROR: Problem 1<br>"
$HTMLcode += "You did this wrong.. <br>"
$HTMLcode += "ERROR Problem 2<br>"
$HTMLcode += "Something happened here.. <br>"
$HTMLcode += "ERROR Porblem 3<br>"
$HTMLcode += "Did you try.. <br>"

Desired result would be:

$HTMLcode=@()
$HTMLcode += "--------------------------<br>"
$HTMLcode += "ERROR: Problem 1<br>"
$HTMLcode += "You did this wrong.. <br>"
$HTMLcode += "--------------------------<br>"
$HTMLcode += "ERROR Problem 2<br>"
$HTMLcode += "Something happened here.. <br>"
$HTMLcode += "--------------------------<br>"
$HTMLcode += "ERROR Porblem 3<br>"
$HTMLcode += "Did you try.. <br>"

Thank you for your help.

Richard · Accepted Answer · 2014-07-07 08:39:15Z

1

Unless you take care, if an operation (cmdlet) in a pipe returns two objects they will be both be placed in the pipe as separate objects.

eg.

2,4,6 | % { %_/2; $_ }

returns

Thus you could do something like:

$updatedHtmlCode = $HTMLCode |
       Select-Object { if ($_ -clike 'ERROR*') { '--------------------------<br>' } $_ }

answered Jul 7, 2014 at 8:39

Richard

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4 Comments

DarkLite1 Over a year ago

Thank you for the help Richard, but it's not really giving the desired result. It's making 6 different arrays with a comma seperator between them.. Which makes it not clean for use in HTML.

Richard Over a year ago

@DarkLite1 something more is going on then. Just tested "foo","bar","bax" | % { if ($_ -eq 'bar') { "xyzzy" } $_ } | % { write-host ($i++); $_ } and the counts clearly show the last select-object executes 4 times.

DarkLite1 Over a year ago

I'm now trying another approach which might be more readable by converting the array to a list $list = New-Object System.Collections.ArrayList(,$HTMLcode) and then insert the vallue with $list.Insert(2,"text"). Now I only need to figure out how to find the correct ID number Int StartIndexvalue for all text starting with ERROR, as it doesn't accept text strings.

DarkLite1 Over a year ago

Hi Richard, your way is indeed the best way of doing it. Thank you for your help, I marked your answer as Solved.

semtex41 · Accepted Answer · 2017-02-04 19:48:08Z

1

Finally found this answer:

$Array = @"
computer1
computer2
computer2
"@ -split "`n" | % { $_.trim() }

The trick is the split and trim. This makes it work down the pipeline. Source: http://pleasework.robbievance.net/howto-easily-convert-block-of-text-into-an-array-in-powershell/

answered Feb 4, 2017 at 19:48

semtex41

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Comments

mjolinor · Accepted Answer · 2014-07-07 11:12:17Z

0

Another possibility:

$htmlcode = @()
$HTMLcode += "ERROR: Problem 1<br>"
$HTMLcode += "You did this wrong.. <br>"
$HTMLcode += "ERROR Problem 2<br>"
$HTMLcode += "Something happened here.. <br>"
$HTMLcode += "ERROR Porblem 3<br>"
$HTMLcode += "Did you try.. <br>"

$htmlcode  -replace '^(?=ERROR)',"--------------------------<br>`n"


--------------------------<br>
ERROR: Problem 1<br>
You did this wrong.. <br>
--------------------------<br>
ERROR Problem 2<br>
Something happened here.. <br>
--------------------------<br>
ERROR Porblem 3<br>
Did you try.. <br>

This doesn't add any additional elements to the array, it just replaces the Error lines with a new string that contains the additional text with an embedded newline before the original text.

For html, it's probably going to get sent through Out-String when you're done, and the final result should be the same as if you'd inserted new lines into the array.

answered Jul 7, 2014 at 11:12

mjolinor

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1 Comment

DarkLite1 Over a year ago

Awesome! This works great too, thank you for the tip on -replace :)

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