Need advice on escaping nasty string

• Support request

There is a string in /lib/prefs/username.php that really gives me headaches. How on earth does this have to be escaped, so tra() will catch it from the array_merge in custom.php?

Here is the entire file:

<?php
// (c) Copyright 2002-2016 by authors of the Tiki Wiki CMS Groupware Project
//
// All Rights Reserved. See copyright.txt for details and a complete list of authors.
// Licensed under the GNU LESSER GENERAL PUBLIC LICENSE. See license.txt for details.
// $Id: username.php 66909 2018-07-07 14:48:30Z chibaguy $

function prefs_username_list()
{
	return [
		'username_pattern' => [
			'name' => tra('Username pattern'),
			'description' => tr('This regex pattern requires or forbids the use of certain characters for username. For example to add Hebrew use: /^[ \'\-_a-zA-Z0-9@\.א-ת]*$/ or for Chinese use: /^[ \'\-_a-zA-Z0-9@\.\x00-\xff]*$/'),
			'type' => 'text',
			'size' => 25,
			'perspective' => false,
			'default' => '/^[ \'\-_a-zA-Z0-9@\.]*$/',
		],
	];
}

I hope you had at least some fun constructing this string... Now I have to rewrite this in double quotes, because that is the syntax in custom.php...

Thanks
hman

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