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Most people do not understand the knowledge points of this article "how to use PCRE2 in php", so the editor summarizes the following content, detailed content, clear steps, and has a certain reference value. I hope you can get something after reading this article. Let's take a look at this "how to use PCRE2 in php" article.

Description

1. Starting with PHP7.3, PCRE2 will be used as a new regular engine.

2. You need to migrate existing regular expressions to PCRE2-compliant rules. These rules are more intrusive than before.

Characteristics

Relative backward reference\ g {+ 2} (equivalent to existing\ g {- 2})

PCRE2 version check (? (VERSION > = x)...)

(* NOTEMPTY) and (* NOTEMPTY_ATSTART) tell the engine not to return an empty match

(* NO_JIT) disable JIT optimization

(* LIMIT_HEAP=d) limit heap size to d KB

(* LIMIT_DEPTH=d) set the backtracking depth limit to d

(* LIMIT_MATCH=d) set the limit on the number of matches to d

Example

Preg_match ('/ [\ wmur.] + /','); what are the php frameworks of php:

1. Laravel,Laravel is a free and open source PHP application framework.

2. Phalcon,Phalcon is the fastest PHP framework.

3. Symfony,Symfony is a PHP framework for Web projects.

4. Yii,Yii is a fast, secure and professional PHP framework.

CodeIgniter,CodeIgniter is a very agile open source PHP framework.

6. CakePHP,CakePHP is an old PHP framework.

7. Kohana,Kohana is an agile but powerful PHP framework.

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