Both of these formats suit my needs:
E1=> work(?:\s+)?group
E2=> work(\s+)?group
I am looking to match either workgroup or work group, taking into account that the space could also be a line break (\s+)?
My main concern is with the first expression which includes a non-capture group (?:). I am curious about whether this impacts the performance or speed of the Regex. So, in terms of efficiency, which expression would be better?
The speed of the regex operation varies depending on the underlying regex engine utilized.
It is uncertain which method yields faster results in JavaScript.
Within PHP, employing a capture group may offer slight performance improvements. A comparison test can be conducted using a basic version of the provided regex pattern.
<?php
$string = "WORD1".str_repeat(" someword",100000);
$regex1="~WORD1(?:\s+\w+){0,2}~";
$regex2="~WORD1(\s+\w+){0,2}~";
$start=microtime(TRUE);
for ($i=1;$i<1000000;$i++) preg_match($regex1,$string);
$noncapend=microtime(TRUE);
for ($i=1;$i<1000000;$i++) preg_match($regex2,$string);
$withcapend=microtime(TRUE);
$noncap = $noncapend-$start;
$withcap = $withcapend-$noncapend;
$diff = 100*($withcap-$noncap)/$noncap;
echo "Non-Capture Group: ".$noncap."<br />";
echo "Capture Group: ".$withcap."<br />";
echo "difference: ".$diff." percent longer<br />";
?>
Result:
Note that outcomes may vary with each execution.
Non-Capture Group: 1.092001914978
Capture Group: 1.0608019828796
difference: -2.857131628658 percent longer
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