Remove a line from a string withing variable without leaving new lines

Question

Writing string to a RichTextBox with the following code

$TextBox.text = "`r`n Some Text `r`n" + $TextBox.text

Under certain circumstances, I need to delete a specific line from the text. The problem, I manage to find and delete the line but the rest of the text moves only 1 line up instead of 2

$TextBox.text = (($TextBox.text -split "`n") | ? {$_ -notmatch 'WordToSearch'}) -join "`n"

As I said, it removes the line, but an unnecessary new line still remains. How can I remove it too without using array or other complicated way?

For example, this is how the text looks:

\\empty line
row 1, some text
\\empty line
row 2, some text
\\empty line

After my attempt of deleting row 1, it looks like this:

\\empty line
\\empty line
row 2, some text
\\empty line

Expected:

\\empty line
row 2, some text
\\empty line

If the first element in the Rich Text at [0] is the empty line, you could use a .Remove() method on it. Not sure off hand if RTB's are a collection or just one long array of strings — trebleCode
– trebleCode, Commented Apr 4, 2018 at 14:41

Bill_Stewart · Accepted Answer · 2018-04-04 14:40:48Z

1

Here's one way to remove blank lines from a string:

$str = "Line 1`r`n`r`n`r`nLine 4`r`n`r`nLine 6"
while ( $str -match "`r`n`r`n" ) {
  $str = $str -replace "`r`n`r`n","`r`n"
}
$str
# now $str contains only "Line 1", "Line 4", and "Line 6"

answered Apr 4, 2018 at 14:40

Bill_Stewart

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2 Comments

igor Over a year ago

This is not the expected result. For the matter, I need to replace Line 6 with 4. rnrnrn there will be no such situation from the first place

Bill_Stewart Over a year ago

My description did not claim to be the answer to your specific question but is a general solution.

Jonathan Leech-Pepin · Accepted Answer · 2018-04-04 17:10:17Z

0

You should be able to use -replace and then .trim() to ensure you don't end up with multiple blank lines (if the line to remove is the last one) then add your final blank line back in with +'`r`n'

$find = "row 1"
$TextBox.text = ($TextBox.text -replace "(?mi)^.*$find.*`$(`r?`n)*",'').trim()+'`r`n'

edited Apr 4, 2018 at 17:10

answered Apr 4, 2018 at 17:04

Jonathan Leech-Pepin

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2 Comments

igor Over a year ago

This method deletes all new lines

Jonathan Leech-Pepin Over a year ago

It removes them all then appends one back to ensure there is still a trailing one.

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