Jasmine
Administrator
Jan 19, 2001, 2:57 PM
Post #1 of 1
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How do I extract selected columns from a string?
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(From the Perl FAQ)
How do I extract selected columns from a string?
Use substr() or unpack(), both documented in the perlfunc manpage. If you prefer thinking in terms of columns instead of widths, you can use this kind of thing: # determine the unpack format needed to split Linux ps output
# arguments are cut columns
my $fmt = cut2fmt(8, 14, 20, 26, 30, 34, 41, 47, 59, 63, 67, 72);
sub cut2fmt {
my(@positions) = @_;
my $template = '';
my $lastpos = 1;
for my $place (@positions) {
$template .= "A" . ($place - $lastpos) . " ";
$lastpos = $place;
}
$template .= "A*";
return $template;
} |
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