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Asked: 2026-05-27T03:34:00+00:00

Im just trying to validate an email ending with a particular string. Im using

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Im just trying to validate an email ending with a particular string. Im using PCRE for this…but cant seem to get it to work. The email needs to end in either boisestate.edu or u.boisestate.edu. I’ve been stabbing at this one for awhile…some help would be really appreciated!

This is what I have so far:

if (preg_match("/[a-zA-Z]+[a-z0-9A-Z_-]+@[\.u]?\.boisestate\.edu$/", "melissa@boisestate.edu", $matches)){
echo "Match was found <br />";
print_r($matches);
}
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1 Answer

  1. Editorial Team

    Instead of trying to do the whole email match and domain check in one, you could just filter_var and a much simpler regex for domain validation.

    Example:

    function check_email($address) {
    if (filter_var($address, FILTER_VALIDATE_EMAIL)
            && preg_match('/@(u\.)?boisestate\.edu$/', $address)) {
        print "We have a match!\n";
    } else {
        print "Match failed!\n";
    }
}

    When called like this:

    check_email('garbage');
check_email('foo@example.com');
check_email('me@u.boisestate.edu');
check_email('you@boisestate.edu');

    You’ll get the output:

    Match failed!
Match failed!
We have a match!
We have a match!

    As far as the regex is concerned, the reason why yours is failing, is because you’re searching for one of the chars in the square-brackets, only once.

    So, you would match things like foo@.boisestate.edu and foo@uboisestate.edu. If you use parenthesis instead of square brackets, the ? will optionally match the entire contents inside the parens.

    @(u\.)?boisestate\.edu$
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