
Jasmine
Administrator
Jan 19, 2001, 2:57 PM
Post #1 of 1
(3389 views)
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How do I extract selected columns from a string?
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Can't Post
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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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