Doing it in two steps is more efficient. From perlfaq4:
It is much better faster to do this in two steps:
$string =~ s/^\s+//;
$string =~ s/\s+$//;
Or more nicely written as:
for ($string) {
s/^\s+//;
s/\s+$//;
}
Here's a benchmark:
use Benchmark;
timethese(500_000, {
one => sub {
my $foo = " perl monks ";
$foo =~ s/^\s+|\s+$//g;
},
two => sub {
my $foo = " perl monks ";
for ($foo) {
s/^\s+//;
s/\s+$//;
}
},
});
And here are the results:
Benchmark: timing 500000 iterations of one, two...
one: 11 secs (11.75 usr 0.00 sys = 11.75 cpu)
two: 8 secs ( 7.57 usr 0.00 sys = 7.57 cpu)
-
Are you posting in the right place? Check out Where do I post X? to know for sure.
-
Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:
<code> <a> <b> <big>
<blockquote> <br /> <dd>
<dl> <dt> <em> <font>
<h1> <h2> <h3> <h4>
<h5> <h6> <hr /> <i>
<li> <nbsp> <ol> <p>
<small> <strike> <strong>
<sub> <sup> <table>
<td> <th> <tr> <tt>
<u> <ul>
-
Snippets of code should be wrapped in
<code> tags not
<pre> tags. In fact, <pre>
tags should generally be avoided. If they must
be used, extreme care should be
taken to ensure that their contents do not
have long lines (<70 chars), in order to prevent
horizontal scrolling (and possible janitor
intervention).
-
Want more info? How to link
or How to display code and escape characters
are good places to start.
|