Thursday, 14 May 2009 20:19 | 
Written by CiscoNET | 
1. Atom An atom is a single character, such as the following
Matches any single character Matches the beginning of the input string Matches the end of the input string Matches the character Matches a comma (,), left brace ({), right brace (}), the beginning of the input string, the end of the input string, or a space.
.
$
\
-
2. Piece A piece is an atom followed by one of the following symbols
Matches 0 or more sequences of the atom Matches 1 or more sequences of the atom Matches the atom or the null string
*
+
?
3. Branch A branch is a 0 or more concatenated pieces
Any occurrence of the letter "a", including none At least one occurrence of the letter "a" should be present) This matches "aa" or "aba" Via AS100 Origin AS100 Coming from AS100 Originated from this AS
a*
a+
ab?a
_100_
^100$
^100 .*
^$
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Last Updated (Friday, 22 May 2009 17:30)
