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Editorial Team
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Asked: 2026-05-13T20:15:27+00:00

I have a simple regular expression to check a username: preg_match(‘/(*UTF8)^[[:alnum:]]([[:alnum:]]|[ _.-])+$/i’, $username); In

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I have a simple regular expression to check a username:

preg_match('/(*UTF8)^[[:alnum:]]([[:alnum:]]|[ _.-])+$/i', $username);

In local testing (Windows 7 using WAMP), this will allow for usernames using UTF characters (such as é or ñ). However, when I move to test this on the server where the site will actually be hosted, I get the following warning:

Warning: preg_match() [function.preg-match]: Compilation failed: (*VERB) not recognized at offset 5 in /home/sites/vgmusic.com/test/Core/Impl/FormElementValidator.php on line 12

I have also tried this on a local Ubuntu installation and get the same error. In fact, I’ve only seen this work on my local development environment. Is there a way to allow for special characters that will work for all operating systems?

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1 Answer

  1. Editorial Team

    Try it by describing the characters by its Unicode character properties:

    preg_match('/^\p{L}[\p{L} _.-]+$/u', $username)
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