Hi,
On Tue, 12 Aug 2003, Patrick Morris wrote:
> Robin Witkop-Staub wrote:
>
> >What does /b in front of this filter mean?
> >
> >body RAVEN_VIAGRA_OBSCURED /\bV.i.a.g.r.a/i
> >describe RAVEN_VIAGRA_OBSCURED contains advertising Viagra by any name
> >score RAVEN_VIAGRA_OBSCURED 50.0
>
> It means the "V" must be preceeded by a "word boundary" (such as a
> space, line break, etc.).
>From `perldoc perlre`:
"A word boundary ("\b") is a spot between two characters that has a "\w"
on one side of it and a "\W" on the other side of it (in either order),
counting the imaginary characters off the beginning and end of the string
as matching a "\W". (Within character classes "\b" represents backspace
rather than a word boundary, just as it normally does in any double-quoted
string.)"
If you have detailed questions about existing rules or you want to write
your own, you really need to read Perl's regular expression docs
first.
-- Bob
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