The pcre. backtrack_limit error message for preg_match Regular Expression matching is displayed.

This article introduces the pcre. backtrack_limit solution for the preg_match Regular Expression matching prompt. If you need it, refer to it.

Use the preg_match regular expression to extract the target content. If there is a problem with live or dead content, the code will be tested to survive.

Later, I suspect that PHP's preg_match has a string length limit, and found that the value of "pcre. backtrack_limit" is set to only 100000 by default.

Solution:

The Code is as follows:	Copy code
Ini_set ('pcre. backtrack_limit ', 999999999 );

Note: this parameter is available after php 5.2.0.

Also, let's talk about:
Pcre. recursion_limit

Pcre. recursion_limit is the recursive limitation of PCRE. If this item is set to a large value, it will consume the available stacks of all processes and eventually cause PHP to crash.

You can also modify the configuration to limit the memory usage: ini_set ('memory _ limit ', '64m ');, this makes it safer.

The Code is as follows:	Copy code
Ini_set ('pcre. recursion_limit ', 99999 );

 

References for other solutions

The Code is as follows:	Copy code
Pcre. backtrack_limit =-1

For more details, see http://www.bKjia. c0m/phper/31/42927 .htm