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Why is this so slow
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Michael Robbins  
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 More options Jul 27 2005, 12:50 pm
Newsgroups: comp.soft-sys.matlab
From: "Michael Robbins" <michaelNOrobbinsSPAMuse...@yahoo.com>
Date: Wed, 27 Jul 2005 12:50:26 -0400
Local: Wed, Jul 27 2005 12:50 pm
Subject: [REGEXP] Why is this so slow
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I'm planning on rewriting it, but it is so nice... if it weren't so
slow! Any ideas before I do?

% SEPARATE THE FUNCTIONS
regex = [
    '(?<=\n\s*)' ...
    '(?<prename>' ...
       'function\s+' ...
       '(?:\[[^\]]*\s*=\s*)?' ...
    ')' ...
    '(?<name>\w+)' ...
    '(?<postname>.*?)' ...
    '(?=\n\s*function\s+)'];
a = regexp(sprintf('\n%s\nfunction ',slurp),regex,'names');

TIA


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Jason Breslau  
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 More options Jul 27 2005, 3:15 pm
Newsgroups: comp.soft-sys.matlab
From: Jason Breslau <tendiamo...@mathworks.com>
Date: Wed, 27 Jul 2005 15:15:07 -0400
Local: Wed, Jul 27 2005 3:15 pm
Subject: Re: [REGEXP] Why is this so slow
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The current implementation of lookbehind in regexp is rather
inefficient.  Avoid using it if possible.  Your pattern will work fine
with that part of the expression converted to a regular group.

-=>J


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Michael Robbins  
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 More options Jul 27 2005, 4:57 pm
Newsgroups: comp.soft-sys.matlab
From: "Michael Robbins" <michaelNOrobbinsSPAMuse...@yahoo.com>
Date: Wed, 27 Jul 2005 16:57:51 -0400
Local: Wed, Jul 27 2005 4:57 pm
Subject: Re: [REGEXP] Why is this so slow
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Jason Breslau wrote:

> The current implementation of lookbehind in regexp is rather
> inefficient. Avoid using it if possible. Your pattern will work
> fine
> with that part of the expression converted to a regular group.

Thanks. I converted the regex and it works well now, though still a
little slow. It turns out there was a small bug in the one I posted
anyway.

BTW, I'm really happy with the features you've put into REGEXP. I
never understood why you wanted to reinvent the wheel but you
certainly did a good job. MATLAB is far better for it.

It'd be really great if you continued to proliferate REGEXP
throughout MATLAB and the IDE.


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