I liked the split method recommended above.
Unfortunately it doesn't work with multiple underscores.
If you want to stick with regexp, then try this:
if (/^(.*?)(?:_([^_]*))?\.pdf$/) {
# do something with $1 and $2
}
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I liked the split method recommended above.
ty
Can you use the OR in the split command to pattern match at the time of the split?
You want the version number to be the last element of the list that split returns, so you could reverse the list, grab the last element, slurp the rest into an array, reverse that array back the right way round again and join the elements with underscores.
There are filenames without "_": 12345.pdf
Yuk, make an @unversioned array and push them into that if you only get one element from split?
#!/usr/bin/perl
use strict;
use warnings;
my @data = qw/12345.pdf
12345_-v1.pdf 12345_Av1.pdf
123456_-v1.pdf 123456_Av1.pdf 123456_Bv1.pdf
g05495_1_-v1.pdf
zprt0019548_wiper_die-nc_-1.pdf zprt0019548_wiper_die-nc
+_-2.pdf
zprt0016809_fg_tooling_A2.pdf zprt0016809_fg_tooling_A
+3.pdf/;
my %hash;
my @unversioned;
for my $f (sort @data) {
my ($version,@key) = reverse split /_/,$f;
my $key = join "_",reverse @key;
if($key) {
$hash{$key} = $version;
}
else {
push @unversioned,$version;
}
}
for my $key (keys %hash) {
print $key . '_' . $hash{$key} . "\n";
}
print join "\n",@unversioned,q{};
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