[antlr-interest] REs

[Matt Benson]

With REs you have

"" 1 occurrence
"()+" 1 or more occurrences
"()?" 0 or 1 occurrences
"()*" 0 or more occurrences

Why, in ANTLR REs, and in REs in general, should there
be no notation such as

"()+n" 1 to n occurrences
"()*n" 0 to n occurrences

or the equivalent?  A maximum of three or even ten is
manageable in a grammar, but the larger the value of
n, the more tempting it is to use ()* and be less than
correct.

-Matt

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