The string length problem of regular matching by preg_match function in PHP, phppreg_match_PHP tutorial

The preg_match function in PHP regularly matches the length of the string. In the phppreg_match

project, preg_match is used to extract the target content. There is a problem, and the code is tested to death.

Later I suspected that PHP's preg_match had a string length limit. Sure enough, I found that the value of "pcre.backtrack_limit" was only set to 100000 by default.

Solution: ini_set('pcre.backtrack_limit', 999999999);

Note: This parameter is available after PHP 5.2.0 version.

In addition, let’s talk about: pcre.recursion_limit

pcre.recursion_limit is the recursion limit of PCRE. If this item is set to a large value, the available stacks of all processes will be consumed, and eventually PHP will crash.

You can also limit it by modifying the configuration: ini_set('pcre.recursion_limit', 99999);

In actual project applications, it is best to limit the memory: ini_set('memory_limit', '64M'); , which is more secure.

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