In HTML page, I remove HTML comments like this
$contentHTML = preg_replace("#(?=<!--)([\s\S]*?)-->#", "", $contentHTML);
But on a huge page for preg_replace, I got "PHP Fatal error: Allowed memory size ..."
Perhaps, one solution, would use the non-matching group to avoid capturing text?
Could someone explain how use on-matching group ?:
Or how can I suppress HTML comments in huge page without preg_replace?
Just unroll the regex as
$contentHTML = preg_replace("#<!--[^-]*(?:-(?!->)[^-]*)*-->#", "", $contentHTML);
See the regex demo. Comapre with yours taking about 3 times as more steps as mine with a very short example.
Details:
<!--- start of comment[^-]*- 0+ non--(?:-(?!->)[^-]*)*- 0+ sequences of-that is not followed with->and then 0+ non--s-->- comment end
来源：https://stackoverflow.com/questions/36885622/php-how-to-set-the-preg-groups-to-non-capture