On Tue, Mar 08, 2011 at 02:29:23PM -0600, Stan Hoeppner wrote:
> So this would mean the simpler expressions would be faster? That makes
> me wonder why Enemies List[1] uses complex expressions, each one
> precisely matching a specific rDNS pattern,
To avoid false positives by matching in the wrong context.
The performance can be improved by grouping:
/^\d+\.\d+\.\d+\.\d+$/ DUNNO only hostnames matched below
if /\.net$/
# patterns for ".net" hosts
...
/^/ DUNNO done with .net[
endif
if /\.net\.au$/
# patterns for ".net.au" hosts
...
/^/ DUNNO done with .net.au
endif
if /\.com$/
# patterns for ".com" hosts
...
/^/ DUNNO done with .com
endif
if /\.edu$/
# patterns for ".edu" hosts
...
/^/ DUNNO done with .edu
endif
--
Viktor.
