Here's a simple grammar tag example that specifies the star key, using jsgf (the default grammar type):
<grammar>"*"</grammar>
Here is the same grammar tag, specified with regexp instead of jsgf:
<grammar type="application/x-jsgf">^"*"$</grammar>
It is also possible to define a more complex grammar consisting of a function key and another key.
For example, if you want * 4 to be a grammar, it can be defined as follows:
<grammar>"*"4</grammar>
Again, same grammar tag, specified with regexp instead of jsgf:
<grammar type="application/x-jsgf">^"*"4$</grammar>
Hope this helps...
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