Features - Include and Exclude Expressions
One of the most useful features of News Rover is its ability to search
through thousands of Usenet news messages and extract only those
messages that match a specific search expression that you have
specified. A News Rover search expression can be as simple as a word
or two, or it can be as complex as you wish with
and, or, not, and near
operators and parentheses.
For example, suppose you are interested in buying a Ford Mustang automobile.
You can create an Interest Group
that searches through all forsale
newsgroups searching for the word "Mustang".
Or, if you are only interested
in buying a 1965 model, you could use the search expression:
Mustang near 1965
When two or more words are specified in a search string separated by
punctuation characters, they only match a message if the message
contains the same words in the same order separated by punctuation
characters. So, "Ford Mustant" would not match
"Mustang Ford". If you
use the and operator between two words, then a match will occur if
a message contains both words regardless of their order or position in
the message. The near operator is similar to and,
but requires that
there not be more than 8 other words between the two being compared.
The or operator matches a message if either word is in the message.
For complex searches, you can use parentheses to specify sub-search
expressions. For example, if you are interested in messages about
planimeters, slide rules, Monroe calculators or Friden calculators,
you could use this search expression:
planimeter or slide rule or
(Monroe near calculator) or
(Friden near calculator)
In addition to searching for messages that include certain words or
phrases, News Rover allows you to exclude messages that
contain certain words or phrases. You can do this either using the
operator or by specifying a separate Exclude expression that has the
same form as the Include expression.
Being able to exclude messages that contain certain phrases can be
very useful. For example, if someone is posting "spam" messages
in newsgroups you frequent, you can use an Exclude expression with
the poster's name or address to exclude all messages from that person.
For example, here is an Exclude expression that will filter out many
opportunity or money or http or 800 or 900 or adult or xxx