How to Properly Validate Email Addresses With Perl

Message in a bottle on the beach that says 'email'

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Is it valid, and will it work? If you collect or use email addresses anywhere in your Perl scripts and programs, you possibly collect many addresses that do not work. One may lack a letter in the domain name, another may have a disallowed character.

Whatever the reasons for its invalidity, you do want to catch the broken address — to prompt the user to re-enter maybe, or to avoid sending an email that's sure to go nowhere.

In Perl, you can concoct a complicated regular expression, of course; or you turn to a handy module that already has one built-in and can check domain names, too.

Validate Email Addresses With Perl

To check email addresses for the well-formedness and validity in a Perl script or program:

  • Build email validation into the HTML code if you have users type email addresses into a web form.
  • Use Email::Valid->address('') from the Email::Valid CPAN Perl module; see below for details, installation and examples.

Email::Valid Email Address Validation Examples

You can have Email::Valid check for valid top-level domains (making sure ".com", ".net", ".cn" or another valid domain name is at the email address's very end). Make sure the Net::Domain::TLD module is installed.

Install the Email::Valid Perl Module

To equip your Perl installation with the Email::Valid module for validating email address correctness:

  • Open a command prompt.
    • Under Mac and Linux, open the Terminal application, for example:
      • Type
        sudo perl -MCPAN -e 'install Email::Valid'
        (Mac and Linux) or
        perl -MCPAN -e 'install Email::Valid'
  • Press Enter.
    • Enter the super user password and press Enter if prompted.
    • When asked "Would you like me to configure as much as possible automatically?", choose yes.
    • If asked "Is it OK to try to connect to the Internet?", enter yes as well.
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