Re: Regex Optimization Question

I think I'd probably do it like this:

$string =~ /Win32_Account.Domain="(.*?)",Name="(.*?)"/;
print $2 eq "" ? "Account Deleted" : "$1\\$2";
[download]

But I don't know if that's more efficient as you haven't told us what axis of efficiency you're interested in. There's efficiency in execution time, efficiency in memory usage, efficiency in programmer time, etc. Generally programmer time is the most important thing to optimize for, so if you understand my version and it does what you want, then maybe it's more efficient. :-)

duff

Comment on Re: Regex Optimization Question Download Code

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Re^2: Regex Optimization Question by ikegami (Patriarch) on Mar 23, 2006 at 20:05 UTC
Using $1, $2, etc without knowing if the regexp matched is dangerous. For example, `foreach ('foo', 'bar') { /(oo)/; print("$1\n"); }` [download] outputs `oo oo` [download]	[reply] [d/l] [select]
Re^3: Regex Optimization Question by aweeraman (Novice) on Mar 23, 2006 at 20:28 UTC
True. I've found that in these cases, doing the regex with pattern memory in its own code block works. `foreach ('foo', 'bar') { { /(oo)/; print("$1\n"); } }` [download]	[reply] [d/l]
Re^4: Regex Optimization Question by ikegami (Patriarch) on Mar 23, 2006 at 21:54 UTC
I didn't know that. Neat!	[reply]
Re^2: Regex Optimization Question by JavaFan (Canon) on May 16, 2011 at 09:37 UTC
There's efficiency in execution time, efficiency in memory usage, efficiency in programmer time, etc. Generally programmer time is the most important thing to optimize for, IMO, it's actually very, very rare if there's a situation where you can pinpoint "the most important thing to optimize for". In fact, I cannot think of any. Generally, they are all important, and it takes a good programmer/manager/project leader to strike the right balance.	[reply]
Re^3: Regex Optimization Question by duff (Parson) on Jun 29, 2011 at 17:48 UTC
Indeed. However, not having any information about where to focus on efficiencies, you can't go wrong on "programmer time" as a sane default thing to optimize. That's why it's generally the most important thing and not specifically the most important thing. :-) duff	[reply]
Re^4: Regex Optimization Question by JavaFan (Canon) on Jul 03, 2011 at 20:14 UTC
You got any data to back that up? Or is that just your opinion? Frankly, I doubt that it will still be your opinion if you gave it half a second of thought. Seriously, if programmer time would be "generally" the most important thing to optimize for, we shouldn't be writing documentation or tests, and copy-and-paste would be preferred over refactoring.	[reply]


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