Bart takes us through the penultimate hat JavaScript wears and that's Regular Expressions. Luckily since we haven't talked about REs in ages, he reminds us of the syntax for Regular Expressions literals in JavaScript first and then he takes us through three common uses for Regular Expressions. We joked around during this episode at how many times I said, "That makes sense!" Bart said it was music to his ears, and I say this was a very intuitive lesson considering how arcane Regular Expressions are in their syntax.