How to filter powershell ssh output - powershell

Question

I use the script described in PowerShell, read/write to SSH.NET streams to get info from my firewall. However I need to isolate only 4 values.
edit "test-connection1"
set vdom "test1"
set ip 192.168.0.1 255.255.255.0
set allowaccess ping
set inbandwidth 10000
set outbandwidth 10000
edit "test-connection2"
set vdom "test1"
set ip 192.168.1.1 255.255.255.0
set allowaccess ping
set inbandwidth 10000
set outbandwidth 10000
--
edit "test-connection3"
set vdom "test2"
set ip 192.168.2.1 255.255.255.0
set allowaccess ping
set inbandwidth 10000
set outbandwidth 10000
I need to show only bold values. New row needs to be created on each "edit". The values can be separated by comma.
I need to get following result
test-connection,test1,10000,10000
test-connection2,test1,10000,10000
test-connection3,test2,10000,10000
How can I manipulate output created in function
function ReadStream($reader)
{
$line = $reader.ReadLine();
while ($line -ne $null)
{
$line
$line = $reader.ReadLine()
}
}

Answer 1

If each edit is predictable, you can do something like the following:
switch -Regex -File edit.txt {
'^edit "(?<edit>[^"]+)"' {$edit = $matches.edit}
'^set vdom "(?<vdom>[^"]+)"' {$vdom = $matches.vdom}
'^set inbandwidth (?<inb>\d+)' {$inb = $matches.inb}
'^set outbandwidth (?<outb>\d+)' { $edit,$vdom,$inb,$matches.outb -join ","}
}
$matches is an automatic variable that contains the result of string comparison using the -match operator. The variable is overwritten every time there is a successful match. Capture group values can be accessed by their names using the member access operator .. This is why you see the syntax $matches.edit to retrieve the value of the edit capture group.
The switch statement can read a file line-by-line using the -File parameter and perform regex matching using the -Regex parameter.
If the format of the edit entries are predictable, we can assume that we will always have an edit, vdom, inbandwidth, and outbandwidth lines in that order. That means we can assume we will have matches in that order and can therefore output all of the edit block matches once outbandwidth is matched.
The regular expressions (regexes) are the values within the single quotes on each line. Below is a breakdown of the two types of expressions used:
^edit "(?<edit>[^"]+)":
^ asserts position at start of a line
edit matches the characters edit literally (case insensitive)
Named Capture Group edit (?[^"]+)
Match a single character not present in the list [^"]+, which means not a double quote character.
Quantifier (+) — Matches between one and unlimited times, as many times as possible, giving back as needed (greedy)
" matches the character " literally (case sensitive)
^set inbandwidth (?<inb>\d+):
^ asserts position at start of a line
set inbandwidth matches the characters set inbandwidth literally (case insensitive)
Named Capture Group inb (?\d+)
\d+ matches a digit (equal to [0-9])
Quantifier (+) — Matches between one and unlimited times, as many times as possible, giving back as needed (greedy)