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Alex Rivera
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Java's Regex.Pattern supports the following character class: [a-z&&[def]] which matches "d, e, or f" and is called an intersection. Functionally this is no different from: [def] which is simpler to read and understand in a big RE. So my question is, what use are intersections, other than specifying complete support for CSG-like operations on character classes? (Please note, I understand the utility of subtractions like [a-z&&[^bc]] and [a-z&&[^m-p]] , I am asking specifically about intersections as presented above.)
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