PHP regular matching method for Chinese and English, numbers and underlines

This article mainly introduces the method of PHP regular matching of Chinese and English, numbers and underscores, which can be used to verify user names. Friends who need it can refer to it. I hope it can help everyone.

1. Question:

The user name when registering is required to be composed of Chinese and English, numbers or underscores, and must not contain other characters.

2. Solution:

Just perform regular verification of Chinese, English, numbers and underscores on the input characters.

The code is as follows:

$username='脚本之家jb51.net@#……^&*';
$preg='/[\w\x{4e00}-\x{9fa5}]+/u';
//$preg='/[\x80-\xff_\w]+/u';
preg_match($preg,$username,$arr);
print_r($arr);

Running result:

Array
(
  [0] => 脚本之家jb51
)

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