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This article shows you how to solve the limitation of too many characters in preg_match matching. the content is concise and easy to understand, which can definitely brighten your eyes. I hope you can get something through the detailed introduction of this article.

But this is not stated in the official documents.

So start testing: the string to be matched continues to shorten until it matches normally when it is shrunk to the original 1ax 5, so it is more certain.

After searching google, I finally found the solution: add it to php.ini (wherever I put it, I put it directly on the first line)

Pcre.backtrack_limit=-1

Once again, use the preg_match function to test that a string of about 1300 lines and tens of thousands of characters can match.

In the project, using preg_match regularization to extract the target content, there is a problem with life or death, and the code is tested again and again.

It turns out that the default value of "pcre.backtrack_limit" is only 100000.

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

Note: this parameter is available after php version 5.2.0.

In addition, about: pcre.recursion_limit

Pcre.recursion_limit is a recursive limitation of PCRE, and if this item is set to a large value, it consumes the available stack of all processes, eventually causing PHP to crash.

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

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

The above is the thinking analysis to solve the limitation of too many characters in preg_match matching. have you learned any knowledge or skills? If you want to learn more skills or enrich your knowledge reserve, you are welcome to follow the industry information channel.

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