Re: in the elemetns of programming perl , I need help with 2 lines that I don't understand

On Mon, Jun 2, 2008 at 11:13 AM, Richard Lee <[email protected]> wrote:
snip
>> To compile the regex.  In the original program, the regexes use the o
>> modifier to promise that $pattern won't change so the optimizer can
>> compile the regexes once, but if you use qr// then you don't have to
>> make that promise and you still only compile the regex once.
snip
> thanks Chas, I have cheat sheet on my monitor and I only had qr as regex, I
> am making a note on the fact that it actually compile only once regex and
> should not be used at all time to do regex build.
snip

I think you misunderstood what I was trying to say.  The o modifier
makes a promise that the variables being substituted into the regex
will not change, thus allowing the optimizer to compile it only once.
The qr// operator does not have this limitation, but still compiles
the regex.


-- 
Chas. Owens
wonkden.net
The most important skill a programmer can have is the ability to read.