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From: David Abrahams (abrahams_at_[hidden])
Date: 2001-06-01 16:13:41

----- Original Message -----
From: "joel de guzman" <isis-tech_at_[hidden]>

> a | b Union (match a or b. Also referred to as alternatives)


> a & b Intersection (match a and b)

Haven't been following closely, but what does this mean? Is it the same as
"ab" in conventional BNF? or perhaps "ab|ba" ?

> a - b Difference (match a but not b)
> a ^ b XOR (match a or b, but not both)

Likewise, what does it mean to match "both"?


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