Question

I have an element with class “4.0.3” how can I search for it?

ff 12.x & latest chrome returns nothing for

console.log($('.4\.0\.3').length);
console.log($(".4.0.3").length);

On the other hand .hasClass() correctly returns if the element got a class that contains .

Answer 1

Escape it with double back-slash

$('.4\\.0\\.3')

http://api.jquery.com/category/selectors/

If you wish to use any of the meta-characters ( such as !”#$%&'()*+,./:;<=>?@[]^`{|}~ ) as a literal part of a name, you must escape the character with two backslashes: \\