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Re: I want to write a function, you call it ,it will return one matched record each time!

by Jenda (Abbot)
on Apr 18, 2013 at 15:51 UTC ( #1029381=note: print w/ replies, xml ) Need Help??


in reply to I want to write a function, you call it ,it will return one matched record each time!

You either want to construct an iterator:

sub open_record_file { my $filein = shift; my $regex = shift; open my $FH, "<$filein" or die "$!\n"; return sub { my $in_block = 0; my $last = "}"; my @array; while (my $line = <$FH>) { if ($line =~ /$regex/) { $in_block = 1; } if ($in_block) { push @array, $line; } if ($line =~ m/$last$/) { $in_block = 0; last; } } return (@array ? \@array : undef); } } my $next_record = open_record_file("input.txt",'DH:'); while (my $record = $next_record->()) { # do something with the array in $record } undef $next_record;
or create a class.

Update: Fixed incorrect filehandle in the while loop. Thanks to poj.

Jenda
Enoch was right!
Enjoy the last years of Rome.


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