PHP preg_match matching string length case analysis

This time I will bring you php preg_match matching string length case analysis, what are the precautions for php preg_match matching string length, the following are Let’s take a look at practical cases.

In the project, there has been a problem using preg_match to extract the target content.
At first I felt that 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.

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 safer.

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