jQuery selector regular expressions

I am after documentation on using wildcard or regular expressions (not sure on the exact terminology) with a jQuery selector.

How can I get which radio is selected via jQuery?

I have two radio buttons and want to post the value of the selected one, how can I get the value with jQuery?

$(this) selector and children?

I'd like to use a selector to select the child img of the div I'm clicking on this example:

jquery selector to count the number of visible table rows?

I've got this html:

<table>

    <tr style="display:table-row"><td>blah</td></tr>

    <tr style="display:none"><td>blah</td></tr>

    <tr style="display:none"><td>blah</td></tr>

    <tr style="display:table-row"><td>blah</td></tr>

    <tr style="display:table-row"><td>blah</td></tr>

</table>

Why "select” options are hidden?

I have a HTML select like this:

<select name="something">

    <option value="a">1</option>

    <option value="b">2</option>

    <option value="c">3</option>

</select>

Which is more efficient: .parent().parent().parent() ~or~ parents(".foo”) ~or~ closest(".foo”)

I have an A tag which triggers the animation of it's great-great-great-grandparent. All of the following will work, but which is most efficient, and why?

jQuery :contains selector to search for multiple strings

Assuming i have:

<li id="1">Mary</li>

<li id="2">John, Mary, Dave</li>

<li id="3">John, Dave, Mary</li>

<li id="4">John</li>

jQuery: How to select "from here until the next H2”?

I'm setting up a very straightforward FAQ page with jQuery. Like so:

How do you remove a class that matches a pattern from the class attribute, but retain the other classes?

I want to delete the classes that end with 'blue' from the class attribute on all tags

Setting the id of a link based on it"s href

$('.portfolioThumbs ul li a').mouseover(

    function(){

        var buttLink = $(this).attr('href') 

        var buttLinkArray = buttLink.split( '/' ); // Split the URL after each / and Create an array of each

        var pFN = buttLinkArray[2]; // We want the Portfolio Folder Name

        var url = window.location.pathname;



        $('.galleryNav ul li a').removeClass('hovered');

        $('.galleryNav ul li a' + '#' + pFN).addClass('hovered');

        window.location.pathname = url + '#' + pFN;

    }       

);