jQuery how to combine this and a variable
<p>I have a form where the ID changes depending on the page.</p>

<p>I am trying to get the value of the input name <code>email</code> but am using <code>$(this)</code> to make sure I don't conflict with any other forms that may be on the same page.</p>

<p>Here is my jQuery code:</p>

<pre><code>jQuery(document).ready(function($) {
    $('#layers-widget-form_builder-27 .builderForm').each(function() {
        $(this).on("submit", function(event) {
            event.preventDefault();
            var formData = $(this).serialize();
            var emailId ='sam.skirrow@gmail.com';
            var emailSubject ='New website form submission';
            var mcListID ='9069741672';
            var mcAPIkey ='d87ebb1e2bf13d4624009f2f5ea9a9aa-us12';
            var mcEmail = $(this + 'input[name="email"]').val(); 
            var mcLname ='last_name';
            var mcFname ='first_name';
            var mcForm = $(this);

            ...

        });
    });
});
</code></pre>

<p>To create a var for email I am using </p>

<pre><code>var mcEmail = $(this + 'input[name="email"]').val();
</code></pre>

<p>but this is throwing up syntax errors - what is the correct way of combining $this with a selector?</p>