powershell get specific row from a body - powershell

Question

i'm getting some problem to get a specific row from a powershell body. HR team send email to us, a logic app get the body of email and pass it to a script that disable the user.
The body is like this:
Hi,
the following user have to be dismiss:
#mail: user1#mycompany.com
#mail: user2#mycompany.com
#mail: user2#mycompany.com
Bye
hr team
hrteam#mycompany.com
i would like to get only the specific row:
#mail: user1#mycompany.com
#mail: user2#mycompany.com
#mail: user2#mycompany.com
to do this i did a trick with following code:
$Body
$SplitBody = $Body.split("").split(" ").Split("#")
$objetbody = $SplitBody.Replace(" ","").Trim()
and i got following result:
Hi,
the
following
user
have
to
be
dismiss:
mail:
user1#mycompany.com
mail:
user2#mycompany.com
mail:
user2#mycompany.com
Bye
hr
team
hrteam#mycompany.com
after that i pass $objetbody into a foreach and loop all row(at the end of this foreach is put a break becouse it can disable HR mail). The flow work if HR sent only 1 mail to disable.
My question is there is a way to got that specific row that contains the mails?
Thanks

Answer 1

Here is a one-liner to output all email addresses using the .NET RegEx class:
[RegEx]::Matches( $body, '(?<=#mail:\s*)\S+' ).Value
The same can be achieved using Select-String:
($body | Select-String '(?<=#mail:\s*)\S+' -AllMatches).Matches.Value
RegEx breakdown:
(?<= ... starts a positive look behind pattern, meaning that the sub string we search for must be preceded by the given pattern, but this pattern won't be included in the result
#mail:\s* ... literal "#mail:" followed by optional whitespace
) ... ends the look behind pattern
\S+ ... any sequence of non-whitespace characters -> the email address
I kept the email address pattern simple, because correctly matching email addresses using RegEx can be hard. Anyway you propably want to do validation as a separate step so you can report invalid addresses. This can be done much simpler using the .NET MailAddress class:
$mailAddresses = [RegEx]::Matches( $body, '(?<=#mail:\s*)\S+' ).Value
foreach( $adr in $mailAddresses) {
try {
[System.Net.Mail.MailAddress]::new( $adr )
} catch {
# The MailAddress constructor throws FormatException for invalid address
Write-Error "Invalid mail address: '$adr'"
}
}

Answer 2

You could use a loop in addition to the -match operator and the use of the automatic variable $Matches:
foreach($line in $Body)
{
if($line -match '^#mail: (.*#.*\.[\w\d]+)')
{
$Matches[1]
}
}
From the example above, $Matches[1] would return the values for the matched capturing group:
user1#mycompany.com
user2#mycompany.com
user2#mycompany.com
If you want to keep #mail: use $Matches[0] instead.