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Thank you for the input. I'll be doing some testing this weekend. I will let everyone know how it went.
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Thank you for the input. I'll be doing some testing this weekend. I will let everyone know how it went.

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Thank you for the comments. I chose Mark's comment because I used his example and made my own lines of codes.
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Thank you for the comments. I chose Mark's comment because I used his example and made my own lines of codes.

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<div class="content wysiwyg-content">
Hello!<br />
<br />
I have a WordPress site but I have no experience with PHP. The website has an account sign up page. <br />
<br />
I'd like to make filling out the 'First Name' and the 'Last Name' fields a requirement when users sign up for an account. I'd also like to implement 'Username' creation restrictions, for example: <br />
<br />
The following special characters are not allowed: <br />
&quot;&nbsp;/ \ [ ] : ; | = , + * ? &lt;&nbsp;&gt;<br />
<br />
For the required fields, I can probably copy the code from the other required fields that is already in place. But the restriction I don't know how to do. Does anybody have a sample code that I can take a look at?<br />
<br />
Thank you &nbsp;in advance!
</div>
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Hello!

I have a WordPress site but I have no experience with PHP. The website has an account sign up page. 

I'd like to make filling out the 'First Name' and the 'Last Name' fields a requirement when users sign up for an account. I'd also like to implement 'Username' creation restrictions, for example: 

The following special characters are not allowed: 
" / \ [ ] : ; | = , + * ? < >

For the required fields, I can probably copy the code from the other required fields that is already in place. But the restriction I don't know how to do. Does anybody have a sample code that I can take a look at?

Thank you  in advance!

Mandatory fields and username restrictions on a WordPress site.

WordPress is a free and open-source content management system (CMS) based on PHP and MySQL for creating websites and blogs. Features include a plugin architecture, a template system and strong management, customization and search systems; through its dynamic presentation of content, webmasters have the flexibility to create websites easily.

WordPress

PHP is a widely-used server-side scripting language especially suited for web development, powering tens of millions of sites from Facebook to personal WordPress blogs. PHP is often paired with the MySQL relational database, but includes support for most other mainstream databases. By utilizing different Server APIs, PHP can work on many different web servers as a server-side scripting language.