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Editorial Team
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Asked: 2026-05-30T19:34:48+00:00

I’m using the PHP preg_match function to validate our company’s emails, which can be

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I’m using the PHP preg_match function to validate our company’s emails, which can be of the form user@mycompany.com or use a subdomain such as user@marketing.mycompany.com or user@it.mycompany.com.

return (preg_match("/^[a-zA-Z0-9_-.+]+@[a-zA-Z0-9-]+.[a-zA-Z]+(\.?mycompany\.com)$/", $testEmail) > 0)

However, the validEmail function returns false for all of the above examples I mentioned. Why?

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1 Answer

  1. Editorial Team
    ^[a-zA-Z0-9_.+-]+@(?:(?:[a-zA-Z0-9-]+\.)?[a-zA-Z]+\.)?mycompany\.com$
    • The 3rd and 4th level domains weren’t made optional ( ()? ) which ruled out anything @mycompany.com and @onesubonly.mycompany.com
    • You forgot to escape a .
    • My Syntax check doesn’t like the unescaped dash in the first character class, but it shouldn’t matter where it is to my knowledge.

    Fun thing on the topic of email regexes (seeing “..@mycompany.com” and the like would pass yours):
    http://www.ex-parrot.com/pdw/Mail-RFC822-Address.html

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