Pippin Williamson

<p>Easily put your site into maintenance mode with this plugin so that you can perform updates. The plugin works by taking a selection of IP addresses and comparing them to the visitor’s IP address.</p>
<p>Users whose IP addresses match those specified in the settings page can view the site normally. Users who do not have IP access are directed either you a WordPress page (which you pick), or to any external url.</p>
<p>It’s extremely simple to use:</p>
<ul>
<li>activate the plugin</li>
<li>go to the “Maintenance Mode” settings</li>
<li>check the “Enable Box”</li>
<li>enter the IP addresses that should have access</li>
<li>choose whether to redirect non-authorized users to a page or url</li>
<li>choose the page or enter the url</li>
</ul>
<p>Once your site is ready to be made available again, simple uncheck the “Enable” box.</p>


CGC Maintenance Mode

Good options, no check if the URL is on the same domain which causes redirect loop.



Almost there

This plugin allows you to put your site into maintenance mode, by allowing only users with specified IP addresses to view the site.

Benaceur

<p>This plugin allows you to Restrict a particular or certain username, email addresses or symbols,<br />
or email from specific domain names in the form registration when registering for your site<br />
and you can allow to use a certain language (arabic cyrillic latin …)<br />
or all languages and characters and symbols, you can also control and modify all errors messages<br />
and allow certain characters (Symbols and characters accented as é û),<br />
and allowing you to change the author slug (defaults to the username of the author),<br />
and you can control and adjust all settings from the plugin settings page in admin Panel.</p>
<h4>and here is all plugin settings in admin Panel:</h4>
<ul>
<li>enable/disable the plugin</li>
<li>disallow to use the spaces in username</li>
<li>disallow to use only numbers in username</li>
<li>disallow all characters (Symbols) in username</li>
<li>disallow characters (Symbols) permitted by wordpress in username: @ – . _</li>
<li>allow certain characters (Symbols and characters accented as é û)</li>
<li>restrict certain email addresses</li>
<li>restrict certain username</li>
<li>restrict certain domain names for example: yournamesite@com</li>
<li>No/yes uppercase in username</li>
<li>Compatible with single site, network (multi-site), buddypress and buddyboss.</li>
<li>The possibility to:</li>
<li>choose language (characters) in username (arabic cyrillic latin …) or all languages</li>
<li>remove all settings and data of the plugin from database when the plugin is disabled</li>
<li>reset default settings</li>
<li>control and modify all errors messages</li>
<li>restrict any name contains a part of word (partial matching)</li>
<li>prevent the use of email in the username</li>
<li>prevent the use of numbers more than letters and symbols in the user name.</li>
<li>allowing you to change the author slug</li>
<li>Author Slug Structure</li>
<li>Update of the author’s slug for all users</li>
<li>Limit the number of users to update (in batches) with every click, if your database is big</li>
<li>Update or convert only names (author slug) not latin</li>
<li>remove name field in buddypress.</li>
<li>hide or change message (Must be at least 4 characters, letters and numbers only.) of multisite.</li>
<li>add an notice or text in registration form.</li>
<li>etc…</li>
</ul>
<h4>TRANSLATED IN FOLLOWING LANGUAGES:</h4>
<ul>
<li>Arabic</li>
<li>English</li>
</ul>
<h4>Direct support page:</h4>
<p>https://benaceur-php.com/?p=2268</p>


Restrict Usernames Emails Characters

Restrict the usernames, email addresses, characters and symbols or email from specific domain names or language in registration ...

CGC Maintenance Mode vs Restrict Usernames Emails Characters