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Re: remove both leading and trailing spaces

by perlmonkey (Hermit)
on Sep 26, 2003 at 06:16 UTC ( #294344=note: print w/replies, xml ) Need Help??

in reply to remove both leading and trailing spaces

Yes, you can do s/^\s+|\s+$//g but it is definaly not optimized. It is generally preferred to use the two regexes, since it is roughly 3 times faster:
use Benchmark; my $val = " Smart Way "; timethese(1000000, { regex1 => sub { my $tmp = $val; $tmp =~ s/^\s+|\s+$//g; }, regex2 => sub { my $tmp = $val; $tmp =~ s/^\s+//; $tmp =~ s/\s+$//; } });
Benchmark: timing 1000000 iterations of regex1, regex2... regex1: 9 wallclock secs ( 6.43 usr + 0.02 sys = 6.45 CPU) @ 155038.76/s (n=1000000) regex2: 2 wallclock secs ( 2.65 usr + 0.00 sys = 2.65 CPU) @ 377358.49/s (n=1000000)

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[Corion]: Maybe the solution would be a tablet (with pens), like the Wacom tablets, but you still need good software and need to know how to operate it well in an interactive setting ;)
[ambrus]: Corion: the solution depends on who for. Some non-math presentations need to show lots of graphics or photos, with fine details and color. For those, blackboard or overhead transparencies aren't so good (yes, you can print on transparencies, but there's s
[ambrus]: ome quality limits), but film projection or computer projector is fine.
[ambrus]: A minority of math presenters are traditional and don't want to operate a computer. For them, handwritten overhead transparencies and blackboard are fine.

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