I've been using jQuery for a while, but generally have  only kept things pretty basic.  I'm trying to parse through some <span> elements on a page, find one which has the content 'Workshop' (a string) and add some custom CSS to it.  addClass() is a pretty usual thing for me to use, but I can't figure out how to have jQuery select the proper span.  $('span') + ??  

Any tips to send me to the right function?