Regular instance of preg_match username in php

Example: letters, numbers, and Chinese characters

The Code is as follows:
If (preg_match ("/['.,:;*?~ '! @ # $ % ^ & + =) (<>{}] | [|/| \ | "|/", $ User )){ Echo 'do not enclose some special characters in the name. Please only use letters, numbers, and Chinese characters. Of course, you must select Simplified Chinese GB2312 in your browser, do not select traditional Chinese or Chinese HZ. Come back and wait for you! '; Exit (); }

Example: All letters

The Code is as follows:
<? Php If (mb_ereg ("^ [w-.] {1, 32} $", $ str )){ Echo 'yes '; } Else { Echo 'no http://www.111cn.net /'; } ?>

Some common Regular Expressions

The username must start with a number or letter and end with a length of 4 ~ 18 characters

The Code is as follows:

The username is an uppercase letter, lowercase letter, or underscore, and starts with a letter. The username must be 6-20 characters long.

The Code is as follows:

Username: the username can contain lowercase letters, Chinese characters, numbers, and underscores (_). The username cannot contain only numbers, but cannot contain underscores (_).

UTF-8Preg_match ("/^ [a-z0-9_x80-xff] + [^ _] $/g", $ );Under gbk:Preg_match ("/^ [a-z0-9 _". chr (0xa1). "-". chr (0xff). "] + [^ _] $/", $)

The Code is as follows:

User name verification in Chinese

The Code is as follows:

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