how to remove non 'ui-*' words by invoking str.replace() with regexp

Question

In Javascript,

str = 'left ui-tabs ui-widget ui-widget-content center right';

Is it possible to remove non 'ui-*' words by invoking str.replace() with regexp ?

The result after invoking str.replace() should be:

str.replace(/ /, '') = 'ui-tabs ui-widget ui-widget-content';

I've tried some regexp patterns, but they doesn't work.

Answer 1

Could try something like:

str.match(/ui-[\w-]+/g).join(" ")

Answer 2

Does it have to be a regex? You could do it this way, but split/join seems like a better candidate here.