Confirm-ValidEmailAddress.ps1

1. <# 
2. .SYNOPSIS 
3.     This script validates email addresses based on 
4.     MSFT published Regular Expression. This is a  
5.     re-write with PowerShell of an existing bit of  
6.     MSDN sample code  
7. .DESCRIPTION 
8.     This script first creates a function to validate 
9.     an email address. It uses a large regex that is 
10.     documented at the MSDN page noted below. The script 
11.     then creates an array of email addreses and then 
12.     validates them against the function and displays 
13.     the results. 
14. .NOTES 
15.     File Name  : Confirm-ValidEmailAddress.ps1 
16.     Author     : Thomas Lee - tfl@psp.co.uk 
17.     Requires   : PowerShell Version 2.0 
18. .LINK 
19.     This script posted to: 
20.         http://pshscripts.blogspot.com/2011/12/confirm-validemailaddressps1.html 
21.     MSDN sample posted to: 
22.         http://msdn.microsoft.com/en-us/library/01escwtf.aspx  
23. .EXAMPLE 
24.     Valid: david.jones@proseware.com 
25.     Valid: d.j@server1.proseware.com 
26.     Valid: jones@ms1.proseware.com 
27.     Invalid: j.@server1.proseware.com 
28.     Invalid: j@proseware.com9 
29.     Valid: js#internal@proseware.com 
30.     Valid: j_9@[129.126.118.1] 
31.     Invalid: j..s@proseware.com 
32.     Invalid: js*@proseware.com 
33.     Invalid: js@proseware..com 
34.     Invalid: js@proseware.com9 
35.     Valid: j.s@server1.proseware.com 
36.     Valid: tfl@psp.co.uk 
37.     Valid: cuddly.penguin@cookham.net 
38. #> 
39.  
40. Function IsValidEmail   { 
41. Param ([string] $In) 
42. # Returns true if In is in valid e-mail format. 
43. [system.Text.RegularExpressions.Regex]::IsMatch($In,  
44.               "^(?("")(""[^""]+?""@)|(([0-9a-zA-Z]((\.(?!\.))|[-!#\$%&'\*\+/=\?\^`\{\}\|~\w])*)(?<=[0-9a-zA-Z])@))" +  
45.               "(?(\[)(\[(\d{1,3}\.){3}\d{1,3}\])|(([0-9a-zA-Z][-\w]*[0-9a-zA-Z]\.)+[a-zA-Z]{2,6}))$");  
46. } # End of IsValidEmail 
47.     
48. [string[]] $emailAddresses = "david.jones@proseware.com", "d.j@server1.proseware.com",  
49.                             "jones@ms1.proseware.com", "j.@server1.proseware.com",  
50.                             "j@proseware.com9", "js#internal@proseware.com",  
51.                             "j_9@[129.126.118.1]", "j..s@proseware.com",  
52.                             "js*@proseware.com", "js@proseware..com",  
53.                             "js@proseware.com9", "j.s@server1.proseware.com", 
54.                             "tfl@psp.co.uk", "cuddly.penguin@cookham.net"  
55.                              
56. ForEach ($emailAddress in $emailAddresses)    { 
57.   if (IsValidEmail($emailAddress)) { 
58.        "Valid: {0}" -f $emailAddress 
59.        } 
60.   else { 
61.         "Invalid: {0}" -f $emailAddress 
62.        }     
63. }                                         

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