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Editorial Team
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Asked: 2026-06-04T08:22:37+00:00

Trying to create a regex pattern for email address check. That will allow a

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Trying to create a regex pattern for email address check. That will allow a dot (.) but not if there are more than one next to each other.

Should match:
test.test@test.com

Should not match:
test..test@test.com

Now I know there are thousands of examples on internet for e-mail matching, so please don’t post me links with complete solutions, I’m trying to learn here.

Actually the part that interests me the most is just the local part:
test.test that should match and test..test that should not match.
Thanks for helping out.

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1 Answer

  1. Editorial Team

    You may allow any number of [^\.] (any character except a dot) and [^\.])\.[^\.] (a dot enclosed by two non-dots) by using a disjunction (the pipe symbol |) between them and putting the whole thing with * (any number of those) between ^ and $ so that the entire string consists of those. Here’s the code:

    $s1 = "test.test@test.com";
$s2 = "test..test@test.com";
$pattern = '/^([^\.]|([^\.])\.[^\.])*$/';
echo "$s1: ", preg_match($pattern, $s1),"<p>","$s2: ", preg_match($pattern, $s2);

    Yields:

    test.test@test.com: 1
test..test@test.com: 0
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