I am having an issue with a line break in my data. The array was made with an out-string followed by -split. If you want to see that part of the script let me know.
Well how about applying mjolinor's code at the $item level, e.g.:
foreach ($item in $array) {
$item -replace '^|$','_'
}
Although I expect the same result you are already getting, there are newlines embedded in your string.
I'm not able to setup the same condition in $array myself, maybe you could post that code.
Does this work?:
foreach ($item in $array) {
$item.Trim() -replace '^|$','_'
}