Jquery Attribute, content and visibility Filters

Filter only on objects that have certain attributes such as give me only objects of .classBob that have a href attribute.

filter an attribute with a certain value, such as ones that only have the class .classBob

Attribute filter that selects objects with that attribute but without the property given. as in give me everything with a class that is not .classBob

Filter an attribute thats property starts with a certain value

filter an attribute that ends with a certain property

filter an attribute that CONTAINS a certain value

If you want two types of attribute filters what would you use? for instance, you want something that has a class attribute and an href attribute

filter for something that has certain text

filter for something that contains nothing

Filter for something that contains a certain sub element. Such as find me all the divs that have p's in them

Filters only elements that have child objects

filters for elements that are diplayed and ones that aren't