Form validation on user profile edit

I worked it out.

add_action( 'user_profile_update_errors', 'validate_steamid_field' );

function validate_steamid_field(&$errors, $update = null, &$user  = null)
{
    if (!preg_match("/^STEAM_[0-5]:[01]:\d+$/", $_POST['_bbp_steamid']))
    {
        $errors->add('empty_steamid', "<strong>ERROR</strong>: Please Enter a valid SteamID");
    }
}

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