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"...
So you need to write a single pattern that matches either of two diffe
+rent patterns (the "or" case) or both of two patterns (the "and" case
+) or that reverses the sense of the match ("not").
This situation arises often in configuration files, web forms, or comm
+and-line arguments.
..."

...It's not a pretty picture, and in a regular program, you'd almost n
+ever do this"...

"...this very place is the Land of Lotuses..." / Hakuin Ekaku Zenji