JQuery syntax

Here is a JQuery tutorial which I don’t understand.

[COLOR=“Blue”]$/COLOR =>select all elements with an href attribute NOT equal to “#”.

[COLOR=“Blue”]$/COLOR =>select all elements with an href attribute that ends with “.jpg”.

what is the $ inside ? what it does there ? There is already a $ outside . I guess $ has something to do with the href attribute that ends with . But how ? Could you please throw somelight on this syntax ? Can I apply this any other places ?

The blue $ is the method name attached to the jQuery object, the red $ is a search modifier (the opposite of ‘^’, ^: starts with…, $: ends with…) for use within sizzle (the CSS selector matcher)