PHP matches regular expressions in UTF-8

This article introduces the knowledge of "PHP matches regular expressions in UTF-8". In the operation of actual cases, many people will encounter such a dilemma, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

I used to use this all the time

The copy code is as follows:

Preg_match ('~ [\ x7f -\ xff] + ~ is', $string, $tmp)

Today, I found that the above one will also match the characters of some European countries.

You should use the following, pay attention to the modifier u

The copy code is as follows:

Preg_match ('~ [\ x {4e00} -\ x {9fa5}] + ~ string, $tmp)

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