point wrote:
I need some help with regulars...
how can I check if $var contains only "----" (minus) no metter how many??
Just as a point of interest, I compared the following 3 regular expressions:
/^-+$/, /[^-]/, /^([-]+)$/
I was going to suggest !preg_match("/[^-]/",$val), then realized it wouldn't
return false on an empty string, but I threw it in anyway. The code I used
follows the comparions. In just about ever case /^-+/ won. No surprised there,
just thought I find out how much different they are. I reordered the regex
array 3 times to make sure the array position wasn't biasing the results.
------
/^-+$/ AVG: 4.4089375120221E-05 seconds (363 sampled)
/[^-]/ AVG: 4.4289953219965E-05 seconds (322 sampled)
/^([-]+)$/ AVG: 4.4381050836472E-05 seconds (315 sampled)
-----------------------------------------3--
/^-+$/ AVG: 4.7261700218106E-05 seconds (324 sampled)
/[^-]/ AVG: 5.3900497155554E-05 seconds (353 sampled)
/^([-]+)$/ AVG: 5.3713196202328E-05 seconds (323 sampled)
--23333333333333333333-------
/^-+$/ AVG: 4.3738299402697E-05 seconds (290 sampled)
/[^-]/ AVG: 4.3901622804821E-05 seconds (351 sampled)
/^([-]+)$/ AVG: 4.5026909342051E-05 seconds (359 sampled)
--3------------------------------------------
/^-+$/ AVG: 4.3636065157915E-05 seconds (349 sampled)
/[^-]/ AVG: 4.4002504405861E-05 seconds (334 sampled)
/^([-]+)$/ AVG: 4.4881733434057E-05 seconds (317 sampled)
TESTINGTESTINGTESTING
/^-+$/ AVG: 4.2770132922486E-05 seconds (298 sampled)
/[^-]/ AVG: 4.4013239057577E-05 seconds (367 sampled)
/^([-]+)$/ AVG: 4.2876200889474E-05 seconds (335 sampled)
REORDER ARRAY
------
/^([-]+)$/ AVG: 4.5152124530541E-05 seconds (334 sampled)
/^-+$/ AVG: 4.4505271685899E-05 seconds (338 sampled)
/[^-]/ AVG: 4.5173778766539E-05 seconds (328 sampled)
-----------------------------------------3--
/^([-]+)$/ AVG: 5.4088808734965E-05 seconds (322 sampled)
/^-+$/ AVG: 4.7325738364301E-05 seconds (341 sampled)
/[^-]/ AVG: 5.387234051079E-05 seconds (337 sampled)
--23333333333333333333-------
/^([-]+)$/ AVG: 4.4645499606867E-05 seconds (331 sampled)
/^-+$/ AVG: 4.3906505752659E-05 seconds (318 sampled)
/[^-]/ AVG: 4.4383894004713E-05 seconds (351 sampled)
--3------------------------------------------
/^([-]+)$/ AVG: 4.4498060430799E-05 seconds (336 sampled)
/^-+$/ AVG: 4.3501577726225E-05 seconds (328 sampled)
/[^-]/ AVG: 4.3935364200955E-05 seconds (336 sampled)
TESTINGTESTINGTESTING
/^([-]+)$/ AVG: 4.281405290943E-05 seconds (326 sampled)
/^-+$/ AVG: 4.2799590290457E-05 seconds (345 sampled)
/[^-]/ AVG: 4.3385659307694E-05 seconds (329 sampled)
REORDER ARRAY
------
/[^-]/ AVG: 4.403849682176E-05 seconds (332 sampled)
/^([-]+)$/ AVG: 4.4901682613106E-05 seconds (329 sampled)
/^-+$/ AVG: 4.3864447107006E-05 seconds (339 sampled)
-----------------------------------------3--
/[^-]/ AVG: 5.405314904047E-05 seconds (339 sampled)
/^([-]+)$/ AVG: 5.3905426187718E-05 seconds (329 sampled)
/^-+$/ AVG: 4.7486948679729E-05 seconds (332 sampled)
--23333333333333333333-------
/[^-]/ AVG: 4.3712762685922E-05 seconds (325 sampled)
/^([-]+)$/ AVG: 4.420560948989E-05 seconds (323 sampled)
/^-+$/ AVG: 4.3457881970839E-05 seconds (352 sampled)
--3------------------------------------------
/[^-]/ AVG: 4.452014041889E-05 seconds (329 sampled)
/^([-]+)$/ AVG: 4.4954001013912E-05 seconds (335 sampled)
/^-+$/ AVG: 4.4005612532298E-05 seconds (336 sampled)
TESTINGTESTINGTESTING
/[^-]/ AVG: 4.2576365675663E-05 seconds (326 sampled)
/^([-]+)$/ AVG: 4.18363008818E-05 seconds (329 sampled)
/^-+$/ AVG: 4.1880469391311E-05 seconds (345 sampled)
---------------- START CODE
<plaintext>
<?php
$str = array("------", "-----------------------------------------3--",
"--23333333333333333333-------",
"--3------------------------------------------", "TESTINGTESTINGTESTING");
function getmicrotime(){
list($usec, $sec) = explode(" ",microtime());
return ((float)$usec + (float)$sec);
}
foreach($str as $strsample) {
$res = array(array("/[^-]/",0,0), array("/^([-]+)$/",0,0), array("/^-+$/",0,0));
for($i=0;$i<1000;++$i) {
$rnd = rand(0,2);
$time_start = getmicrotime();
preg_match($res[$rnd][0], $strsample);
$time_end = getmicrotime();
$res[$rnd][1]++;
$res[$rnd][2] += ($time_end - $time_start);
}
echo "\n\n ".$strsample."\n\n";
foreach($res as $val) {
echo " ".$val[0];
for($i=strlen($val[0]);$i<10;++$i) {
echo " ";
}
echo("\tAVG: ".($val[2] / $val[1])." seconds (".$val[1]." sampled)\n");
}
}
?>
---------------- END CODE
Shawn
--
Shawn Wilson
sh***@glassgiant.com http://www.glassgiant.com 
