I need to do multiple substitutions in several large (1-10MB) files. I've been using this:
use strict;
use warnings;
use Tie::File;
foreach my $x (@ARGV) {
tie my @f, 'Tie::File', $x or die "Could not tie $x: $!\n";
for (@f) {
s/^\|/\\N\|/;
s/\|\s*$/\|\\N/;
s/\|\s*\|/\|\\N\|/g;
s/\|\.\s*\|/\|\\N\|/g;
s/\|\s+/\|/g;
s/\s+\|/\|/g;
s/(\d{2}:\d{2}:\d{2})\.\d+/$1/g;
s/(\d{5})-(?:\d{1,4}|\s+)/$1/;
}
}
...but this is taking entirely too long, and using up too much CPU. How can I do this more efficiently?
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