How to realize matching and substitution of php regular function

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Php regular function to achieve matching replacement methods: 1, to create a PHP example file; 2, to create regular expressions; 3, through the preg_replace function to perform regular expression matching and replacement.

This article operating environment: windows7 system, PHP7.1 version, DELL G3 computer

How do php regular functions achieve matching substitution?

Matching and substitution of php regular expressions

Only two regular expression functions that are compatible with Perl are introduced:

1.preg_match_all function performs regular expression matching and search

The 2.preg_replace function performs regular expression matching and substitution.

Sample code: