Examples of php Chinese character regular expressions

Source: Internet
Author: User
Tags php programming regular expression


Chinese character regular expression in gbk encoding


1. Determine whether the string is full of Chinese characters

The code is as follows: Copy code
<? Php
$ Str = 'All are Chinese character test ';
If (preg_match_all ("/^ ([x81-xfe] [x40-xfe]) + $/", $ str, $ match )){
Echo 'all Chinese characters ';
} Else {
Echo 'all Chinese characters ';
    }
?>

When $ str = 'All are Chinese character test', the output "all are Chinese characters ";
When $ str = 'All is a Chinese character test', the output is "not all Chinese characters ";

2. Determine whether a string contains Chinese characters

The code is as follows: Copy code
<? Php
$ Str = 'Chinese character 3 test ';
If (preg_match ("/([x81-xfe] [x40-xfe])/", $ str, $ match )){
Echo 'contains Chinese characters ';
} Else {
Echo 'contains no Chinese characters ';
    }
?>

When $ str = 'Chinese character 3 test', the output "contains Chinese characters ";
When $ str = 'abc345';, the output "contains no Chinese characters ";

The content of the above variable $ str is irrelevant to utf8 or gbk encoding and the result is the same.

How to match Chinese characters with regular expressions in UTF-8 encoding

 

The code is as follows: Copy 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 ");
}
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