Your Wish is My Command

12.5 An Example: Defining a Grammar for Email Addresses 233

I

2. An

Example: Defining a Grammar for Email Addresses

We start defining the pattern for E-Mail-Address by beginning with a new

example that we would like to teach the system to handle. We get a new

Grammex rule window and type in the name for our grammar, E-Mail-

Grammar; the name of the definition, E-Mail-Address; and the example text

[e-mail] (Figure 12.3).

The Grammex window has two modes:

Edit

and

Parse.

In Edit mode, the

bottom view functions as an ordinary text editor; the user can type in it or

cut and paste text from other windows ...