Regular expression to get a class name from html

Question

I know my question might look like a duplication for this question, but its not
I am trying to match a class name inside html text that comes from the

Answer 1

Regular expressions are not a good fit for parsing HTML. HTML is not regular.

jQuery can be a very good fit here.

var html = 'Your HTML here...';

$('
' + html + '
').find('[class~="b"]').each(function () {
    console.log(this);
});

The selector [class~="b"] will select any element that has a class attribute containing the word b. The initial HTML is wrapped inside a div to make the find method work properly.