Powershell search through two lines - powershell

Question

I have following Input lines in my notepad file.
example 1 :
//UNION TEXT=firststring,FRIEND='ABC,Secondstring,ABAER'
example 2 :
//UNION TEXT=firststring,
// FRIEND='ABC,SecondString,ABAER'
Basically, one line can span over two or three lines. If last character is , then it is treated as continuation character.
In example 1 - Text is in one line.
In example 2 - same Text is in two lines.
In example 1, I can probably write below code. However, I do not know how to do this if 'Input text' spans over two or three lines based on continuation character ,
$result = Get-Content $file.fullName | ? { ($_ -match firststring) -and ($_ -match 'secondstring')}
I think I need a way so that I can search text in multipl lines with '-and' condition. something like that...
Thanks!

Answer 1

You could read the entire content of the file, join the continued lines, and then split the text line-wise:
$text = [System.IO.File]::ReadAllText("C:\path\to\your.txt")
$text -replace ",`r`n", "," -split "`r`n" | ...

Answer 2

# get the full content as one String
$content = Get-Content -Path $file.fullName -Raw
# join continued lines, split content and filter
$content -replace '(?<=,)\s*' -split '\r\n' -match 'firststring.+secondstring'

Answer 3

If file is large and you want to avoid loading entire file into memory you might want to use good old .NET ReadLine:
$reader = [System.IO.File]::OpenText("test.txt")
try {
$sb = New-Object -TypeName "System.Text.StringBuilder";
for(;;) {
$line = $reader.ReadLine()
if ($line -eq $null) { break }
if ($line.EndsWith(','))
{
[void]$sb.Append($line)
}
else
{
[void]$sb.Append($line)
# You have full line at this point.
# Call string match or whatever you find appropriate.
$fullLine = $sb.ToString()
Write-Host $fullLine
[void]$sb.Clear()
}
}
}
finally {
$reader.Close()
}
If file is not large (let's say < 1G) Ansgar Wiechers answer should do the trick.