Java Regex - Matching Character Classes

Following are various examples of matching character classes using regular expression in java.

Sr.No	Construct & Matches
1	[abc] a, b, or c (simple class).
2	[^abc] Any character except a, b, or c (negation).
3	[a-zA-Z] a through z or A through Z, inclusive (range).
4	[a-d[m-p]] a through d, or m through p: [a-dm-p] (union).
5	[a-z&&[def]] d, e, or f (intersection).
6	[a-z&&[^bc]] a through z, except for b and c: [ad-z] (subtraction)
7	[a-z&&[^m-p]] a through z, and not m through p: [a-lq-z](subtraction).