[Question about a regular expression]

[Ask a regular expression question] problem description: prohibit full letters, prohibit full numbers, prohibit special characters, prohibit punctuation marks, length 2 to 7 characters; if it is difficult to write down the above, only Chinese strings are allowed. The length should be 2 to 7 characters; special characters are prohibited; punctuation marks are prohibited; in short, it is to match a 2-7 Chinese character string. [ask a regular expression question]
Problem description:
Prohibit all letters;
Prohibit all numbers;
Special characters are prohibited;
Punctuation marks are prohibited;
It can contain 2 to 7 characters;


If the above is more difficult, you can directly write the following

Only Chinese strings are allowed;
It can be 2 to 7 characters in length;
Special characters are prohibited;
Punctuation marks are prohibited;




------ Solution --------------------
In short, it is to match a 2-7 Chinese character string.
------ Solution --------------------
In fact, this problem can be found by Baidu. The following is the reference code:
$ Str = "php programming ";
If (preg_match ("/^ [\ x {4e00}-\ x {9fa5}] + $/u", $ str )){
Print ("all strings are Chinese ");
} Else {
Print ("Not all strings are Chinese ");
}
------ Solution --------------------
You can add a character set to convert the length and then determine the corresponding length.