[erlang-questions] re: re:pain (and stripping whitespace from text)

[Hynek Vychodil]

On Sun, Mar 14, 2010 at 7:35 AM, Robert Virding <rvirding@REDACTED> wrote:
> On 14 March 2010 03:45, Jayson Vantuyl <kagato@REDACTED> wrote:
>> Also, note that backtracking and recursion can create very undesirable behavior in terms of stack usage and execution time.  This is so problematic that Google has written a special regex library that uses research in automata theory to make it behave better.  See here:
>>
>> RE2:  http://code.google.com/p/re2/
>
> I did a regexp version in Erlang based on these principles and it is
> actually time linear in the size of the input. It is fun to see it zip
> through what would be for Perl/PCRE a super backtracking pathological
> case in a flash. One day when I get the time to cleanup the code I
> will release it.

I thought about similar in context of
http://shootout.alioth.debian.org/u32q/performance.php?test=regexdna
but with limited functionality and as specialized parse
transformation. But I didn't because I was too busy.

>
> Robert
>
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-- 
--Hynek (Pichi) Vychodil

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