On 28/09/11 11:33 PM, Alex Shinn wrote:
On Thu, Sep 29, 2011 at 12:25 PM, Alan Post<alanp...@sunflowerriver.org> wrote:
How did irregex, which by account is slower, replace the existing
regex code?
I didn't make the call, but as I understand that was motivated
by portability concerns, simplifying the Chicken distribution,
and avoiding the frequently occurring memory bugs in PCRE.
So speed wasn't a concern, but there is a class of regexps
for which irregex is exponentially faster than PCRE.
And if I am not mistaken this rationale is nicely given by Russ Cox:
http://swtch.com/~rsc/regexp/regexp1.html
--Toby
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