Removes all elements from the set of matched elements that do not match the specified expression(s). This method is used to narrow down the results of a search. Provide a comma-separated list of expressions to apply multiple filters at once. Expression(s) to search with. Selects all paragraphs and removes those without a class "selected". <p class="selected">Hello</p><p>How are you?</p> $("p").filter(".selected") [ <p class="selected">Hello</p> ] Selects all paragraphs and removes those without class "selected" and being the first one. <p>Hello</p><p>Hello Again</p><p class="selected">And Again</p> $("p").filter(".selected, :first") [ <p>Hello</p>, <p class="selected">And Again</p> ] Removes all elements from the set of matched elements that do not pass the specified filter. This method is used to narrow down the results of a search. A function to use for filtering Remove all elements that have a child ol element <p><ol><li>Hello</li></ol></p><p>How are you?</p> $("p").filter(function(index) { return $("ol", this).length == 0; }) [ <p>How are you?</p> ]