Tree
Definitions : Node : data stored at one location in the tree(A,B,C,D,E,F,G,H,I,J) Root node : top most node in the tree from which all other nodes originate(A) Leaf node : A node with no sub trees(D,E,F,I,J,G) Child: a node that descends from an existing node(B->J) Parent : root of the child node (A parent B) Siblings : nodes that have the same parent(H,G) Ancestor : All nodes that can be reache..
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Regular Expression
^ caret ^aaa the first line or beginning of string in the beginning of string, if there is "aaa" then true,otherwise false $ dollar aaa$ end of line or end of string in the end of line, if the line end with "aaa", then true, otherwise false . period ^a.c a..b$ exact one character "abc","adc","aZc",.. are true, "aa" is false end of string with these string,"aaab","abbb",azzb",..., then true [] br..
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