Looking for blocks of the same char speeds it up a bit:
$s = join'', map{ chr( 65+rand(26) ) x rand( 100 ) } 1 .. 1000;;
cmpthese( -1,{
a=>q[
1 while $s =~ m[((?=(.))\2+)]g;
],
b=>q[
1 while $s =~ m[((?=(.))\2+)]sg;
] ,
c=>q[
1 while $s =~ m/((.)\2*)/sg;
],
d=>q[
1 while $s =~ m{
(
(?=(.))
(?:
(\2\2\2\2\2\2\2\2) \3*
| (\2\2\2\2) \4*
| (\2\2) \5*
| \2+
)+
)
}sgx;
],
});
Rate b a c d
b 193/s -- -0% -3% -35%
a 194/s 0% -- -2% -35%
c 198/s 3% 2% -- -33%
d 296/s 54% 53% 50% --
Dave.
-
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.
|