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Re: How to ignore lines that match certain string after it is matched for the first time within a same file

by Kenosis (Priest)
on Sep 19, 2012 at 23:47 UTC ( #994564=note: print w/replies, xml ) Need Help??


in reply to How to ignore lines that match certain string after it is matched for the first time within a same file

Perhaps the following will work for you:

use strict; use warnings; my ( @array, %seen ); while ( my $line = <DATA> ) { if ( $line =~ /(amazing\.\S+)/ and not $seen{ lc $1 }++ ) { push @array, $line; #print $line; } } print for @array; __DATA__ Today is amazing.nice day Today is amazing.nice but still I haven't done anything Yesterday was just a normal day Tomorrow probably will be amazing.new day

Output:

Today is amazing.nice day Tomorrow probably will be amazing.new day

$1 captures amazing\.\S+ and using lc on the hash key helps insure case is not significant in uniqueness.

Hope this helps!

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[Corion]: But now I want to register a one-shot for two events, of which only one will arrive, so my data structure doesn't work anymore...
[Lady_Aleena]: Corion, ouchy.
[Corion]: (maybe I should write this up as a SoPW) - currently, the "most efficient" data structure I come up with is a single array which I scan for the first fitting one-shot. Not efficient but I don't expect more than five outstanding one-shots anyway
[choroba]: can't you create a meta-key corresponding to the disjunction of the events?
[robby_dobby]: Corion: Heh. This whole thing smells of Strategy Pattern or MVC pattern.
[Corion]: And performance linear to the number of registered one-shots doesn't feel that bad. Maybe I should collect statistics on how many callbacks are outstanding ;)
[Corion]: choroba: Yes, but the longer I thought about efficient hashes mapping the event type back to their callbacks, and how to keep them in sync, the more I thought that all that optimization might just not be worth it, even if it's horribly inelegant
[Lady_Aleena]: My biggest problem with hashes at the moment is one with 2,501 keys.
[choroba]: how many event types are there?
[Corion]: Also I found that I can't conveniently weaken an array slot, which also is inconvenient, as I want my one-shots to disappear if the caller discards them

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