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added detailed regular expression explanation to community.list
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@ -18,4 +18,20 @@ ntop[0-1][0-9]
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#
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# * Only fixed-name communities are supported for header encryption (-H)
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#
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# * Regular expression support the following placeholders
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# '.' Dot, matches any character (meaningless, as full matches only)
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# '^' Start anchor, matches beginning of string (meaningless, as full matches only)
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# '$' End anchor, matches end of string
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# '*' Asterisk, match zero or more (greedy)
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# '+' Plus, match one or more (greedy)
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# '?' Question, match zero or one (non-greedy)
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# '[abc]' Character class, match if one of {'a', 'b', 'c'}
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# '[^abc]' Inverted class, match if NOT one of {'a', 'b', 'c'} (feature is currently broken)
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# '[a-zA-Z]' Character ranges, the character set of the ranges { a-z | A-Z }
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# '\s' Whitespace, \t \f \r \n \v and spaces
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# '\S' Non-whitespace
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# '\w' Alphanumeric, [a-zA-Z0-9_]
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# '\W' Non-alphanumeric
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# '\d' Digits, [0-9]
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# '\D' Non-digits
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#
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