Just a thought

[Kevin Spicer]

On Sat, 2004-03-06 at 16:54, Julian Field wrote:
> I thought it only made a difference for regexps that include variables. I
> had hoped that regexps including only static texts would only be compiled
> once. Anything in the Perl docs to back either of our views?
>
According to 'Programming Perl' the /o modifier prevents recompilation
of the regular expression when it contains an interpolated variable
(ref. p.148).  So you are correct.  There is a great section on
optimisation techniques in that book.  With its help I was able to
optimise a program I wrote (which is responsible for mirroring certain
types of files between a local disk and a remote ftp server) from taking
a few minutes to taking a few seconds  (this is probably a reflection on
the poor quality of my original code as much as anything else!).




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