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Re: Merged list with regex matches

by Sidhekin (Priest)
on Sep 04, 2007 at 15:49 UTC ( #636966=note: print w/replies, xml ) Need Help??

in reply to Merged list with regex matches

On the assumption that every $cn will match at most one $bn (or that you don't care about more than the first), you could precompile a regex and use the result of the match:

#!/usr/bin/perl use strict; use warnings; my @CS_CHECKS = ( '00012345', 'D123470', '0000123450', '0000023456', ' +50000123990' ); my @B_CHECKS = ( '1234', '12345', '123990', '12399' ); my $re = do { my $x = join '|', map "\Q$_", @B_CHECKS; qr/^[056]0+($x) +$/ }; $_ =~ $re and print "$1 = $_\n" for @CS_CHECKS;

Of course, the regex engine is still run through the alternatives (up until one matches), but at least it looks more elegant. :)

(Oh, and it may be faster too, what with not having to recompile the regex again and again. But don't quote me on that.)

print "Just another Perl ${\(trickster and hacker)},"
The Sidhekin proves Sidhe did it!

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[Corion]: ambrus: Yes but I also need to implement the file / IO watcher, because Prima has that (in Prima::File), and I need to supply the appropriate thing to make push_write etc. work with Prima
[ambrus]: Corion: yes, you need to implement the io watcher, which should be simple because Prima::File is basically that, and the timer watcher form Prima::Timer
[Corion]: ... or so I think. As I said, I'm somewhat vague on how to make AnyEvent cooperate with a callback-driven IO event loop that gives me callbacks when data is available or can be written
[ambrus]: what push_write thing? I don't think you need that. that's implemented generically by AnyEvent::Handle
[Corion]: ambrus: Yeah, that's what I think as well. But you give me an idea, maybe I should start with implementing the timer, as that should be far simpler and with fewer edge-cases/nasty interaction than the file watcher
[ambrus]: You only provide the watcher part that tells when the handle is readable or writable, not the actual writing and reading.
[Corion]: ambrus: Hmmm. It makes sense that AnyEvent would implement the push_write itself, but I think I don't have a good idea of where the boundary between AnyEvent and the underlying event system lies... Implementing the timer should give me a better idea
[ambrus]: Corion: push_write is in the higher level abstraction of AnyEvent::Handle, not in the watcher
[Corion]: ambrus: Hmm - rereading Prima::File, that merrily coincides with what Prima does - it tells you "you can read", and you're supposed to read from the fh yourself. I thought it called you with the data already read, which would've been harder to integrate
[ambrus]: you just need an io watcher, created by &AnyEvent::Impl:: Whatever::io(...)

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