XenForo Regex Not Working

[btmgreg]

Hey all,

I've been trying to use the following template as a custom validator. The rest seem to be working fine, but I think this one is because the url has a hyphen inside like this -

https://www.linkedin.com/in/connor-hammond-5ba789137/

Code:

<?php

namespace XF\Validator;

use function is_string;

class Linkedin extends AbstractValidator
{
    public function isValid($value, &$errorKey = null)
    {
        if (!preg_match('/^[a-z0-9_]+$/i', $value))
        {
            $errorKey...

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