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PowerShell validate list of email addresses


Validate list of email addresses in a text file and check which email is a valid email and which one has the incorrect format.

PowerShell code below can easily check or validate incorrect email, output will show true if valid email and false if the email is not valid.

To check list of valid emails PowerShell utilizes regex. This is useful to check typo errors when sending out mass email or a list of emails which has not yet been verified.

But of course, the code will not be able to check whether the emails are active or not.

#===============================

$reader = [System.IO.File]::OpenText("c:\all_emails.txt") #get-content can also be used

while($null -ne ($line = $reader.ReadLine())) {

    #$line
    $regx="[a-z0-9!#\$%&'*+/=?^_`{|}~-]+(?:\.[a-z0-9!#\$%&'*+/=?^_`{|}~-]+)*@(?:[a-z0-9](?:[a-z0-9-]*[a-z0-9])?\.)+[a-z0-9](?:[a-z0-9-]*[a-z0-9])?"

    [regex]::Match($line, $regx, "IgnoreCase ")  |  format-Table success, value -AutoSize
}

#===============================

format-Table success, value -AutoSize -- this will trim empty white spaces

I found the regex validation in stackoverflow, and formatting the output can be found using the Technet link below.

references:




Cheers! Till next time.



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