Re: How do I tighten this with map?

This assumes %fileHash is empty beforehand, and that you meant to escape that . in the regex...

%fileHash = map {
  /^(\w\w\w\d*):log\.$date$/ ? ($1, $_) : ()
} readdir DIR;
[download]

_____________________________________________________
Jeff[japhy]Pinyan: Perl, regex, and perl hacker.
s++=END;++y(;-P)}y js++=;shajsj<++y(p-q)}?print:??;

Comment on Re: How do I tighten this with map? Download Code

Replies are listed 'Best First'.
Re: Re: How do I tighten this with map? by mikeB (Friar) on Oct 16, 2001 at 20:08 UTC
Just curious why you replaced \w{3} with \w\w\w.	[reply]
Re3: How do I tighten this with map? by Hofmator (Curate) on Oct 17, 2001 at 16:13 UTC
That's a little speed optimisation, with `/\w{3}/` the regex engine sees the {} construct and has to start counting. If you write it out it's just three single characters in a row, so no counting => quicker. Of course, this could be optimised by the regex compiler but that wasn't the case at the time of writing of Mastering Regular Expressions. At least this is where I got this from. As japhy is more up to date on this I assume he has checked that this optimisation hasn't been done in the meantime. -- Hofmator	[reply] [d/l]
Re: Re: How do I tighten this with map? by SparkeyG (Curate) on Oct 16, 2001 at 20:06 UTC
Thank you japhy. That's what I was looking for exactly, and I think I understand most of it. --SparkeyG	[reply]