Missing parenthesis

Close parenthesis

Missing right parenthesis

Unbalanced right parenthesis

That's a parenthesis.

I'm a parenthesis?

We saw an open parenthesis and then another open parenthesis.

You may want to consider having parenthesis nested inside other parenthesis.

Just an open parenthesis.

I close off the parenthesis, escaping the closed parenthesis just to make sure.

We have a close parenthesis followed by 1956 followed by an open parenthesis.

Here tag open and tag close are a lot like open parenthesis and close parenthesis.

Unfortunately, all we can write with regular expressions is open parenthesis star close parenthesis star.

Consider this grammar for balanced parenthesis.

Here we write open pulitzer plus open prize close close open parenthesis, open parenthesis, close, close.

So freezing means you escape the parenthesis.

Let me close the parenthesis right there.

P reduces to or can be rewritten as open parenthesis P, closed parenthesis. or P can just disappear.

Here's what we want an open parenthesis followed by a close parenthesis, each repeated the same number of times.

That's an identifier, like myfun , followed by a Left parenthesis, followed by some optional arguments, followed by a Right parenthesis.

It's as if the beginning bold b were some sort of parenthesis and the ending bold b were a closed parenthesis.

Now I want to match immediately an opening parenthesis.

I guess I didn't have to write those parenthesis.

To evaluate this, it starts at the inner parenthesis.

The closing parenthesis looks just the same, but the opening parenthesis the version you'll be using in this class is 3 characters (? ).

We took this rule here and move our finger over, shift it past this open parenthesis, so we get open parenthesis dot P close.

If you look over here, there's actually no way to make just a lonely open parenthesis that does not have a matching close parenthesis.

If we add a matching left and right parenthesis, the expression that is equal to is simply the contents of the parenthesis, pretty straightforward.

You're a break from our normal lives, you're a... a parenthesis.

Well this is a plus here, so the parenthesis really don't matter.

This one has a space between the function name and the parenthesis.

Python regular expressions have similar parenthesis, but they're written a litttle differently.

P closed parenthesis, or P goes to nothing and can be erased.

Then we saw this left parenthesis and Here's where we are now.

I will escape that opening parenthesis just to make sure that it works.

It has parenthesis, and then it has a single argument that's a number.

Here are the two rules in this grammar, P goes to open parenthesis,

So we haven't seen anything yet is the next token an open parenthesis?

We got here by reading in the input, left parenthesis, from chart position 0.

A function call is going to be identifier, with optional argument in between parenthesis.

This particular method call has no arguments, there's just nothing between the two parenthesis.

I'm not going to predict seeing a string until I've seen an open parenthesis.

Since one of the things I'm considering is that P is totally empty, up here I was thinking, oh, I could've seen a left parenthesis and been expecting a P and then a right parenthesis, but if P disappears then I'm already past it, and I'm expecting a right parenthesis.

We're going to see the token that's the left parenthesis and we're going to shift.

What we really want is open parenthesis to the power of N, closed parenthesis to the power of N, but this has to be the same N in order for the parentheses to be balanced.