如何忽略由特定字符串包装的正则表达式匹配？

Long time lurker, first time poster- please bare with me, I'm a regular expression n00b, but I had a great idea for some functionality on a project and I've tried to implement it to the best of my ability but I need a little help achieving the desired effect. The page in question is: Long time lurker, first time poster- please bar