PHP regular expression matching Chinese_PHP tutorial-PHP Tutorial-php.cn

PHP regular expression matching Chinese_PHP tutorial

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Release： 2016-07-13 10:44:59

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To use regular expressions to match Chinese characters in php, we need to understand the string encoding and the internal code of the Chinese characters. This way we can quickly and easily accurately match Chinese characters. Let me introduce it to you.

To determine whether a string is Chinese in php, you will follow this idea:

The code is as follows

代码如下	复制代码
$str = "php编程"; if (preg_match("/^[u4e00-u9fa5]+$/",$str)) { print("该字符串全部是中文"); } else { print("该字符串不全部是中文"); } ?>

Copy code

$str = "php programming";

if (preg_match("/^[u4e00-u9fa5]+$/",$str)) {

print("This string is all in Chinese");

} else {

print("This string is not all Chinese");

}

代码如下	复制代码
$str = "php编程"; if (preg_match("/^[x4e00-x9fa5]+$/",$str)) { print("该字符串全部是中文"); } else { print("该字符串不全部是中文"); }

However, you will soon find that php does not support such expressions and an error message is reported:

Warning: preg_match() [function.preg-match]: Compilation failed: PCRE does not support L, l, N, U,

or u at offset 3 in test.php on line 3

I checked it many times on Google at the beginning and wanted to use PHP regular expressions for hexadecimal data

I made a breakthrough in the way of expression and found that in php, x is used to represent hexadecimal data. So,

is transformed into the following code:

The code is as follows

代码如下

复制代码

(1) ANSI编程环境下:

$strtest = “yyg中文字符yyg”;

$pregstr = "/([".chr(0xb0)."-".chr(0xf7)."][".chr(0xa1)."-".chr(0xfe)."])+/i";

if(preg_match($pregstr,$strtest,$matchArray)){

echo $matchArray[0];

}

//output:中文字符

(2) Utf-8编程环境下:

$strtest = “yyg中文字符yyg”;

$pregstr = "/[x{4e00}-x{9fa5}]+/u";

if(preg_match($pregstr,$strtest,$matchArray)){

echo $matchArray[0];

}

//output:中文字符

Copy code

$str = "php programming";

if (preg_match("/^[x4e00-x9fa5]+$/",$str)) { print("This string is all in Chinese");

} else {

Here are two examples:

The code is as follows

Copy code

(1) In ANSI programming environment: $strtest = “yyg Chinese character yyg”; $pregstr = "/([".chr(0xb0)."-".chr(0xf7)."][".chr(0xa1)."-".chr(0xfe)."])+/ i"; if(preg_match($pregstr,$strtest,$matchArray)){ echo $matchArray[0]; } //output: Chinese characters (2) In Utf-8 programming environment: $strtest = “yyg Chinese character yyg”; $pregstr = "/[x{4e00}-x{9fa5}]+/u"; if(preg_match($pregstr,$strtest,$matchArray)){ echo $matchArray[0]; } //output: Chinese characters http://www.bkjia.com/PHPjc/633077.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/633077.htmlTechArticleIf we want to use regular expressions to match Chinese characters in php, we need to understand the string encoding and the internal code of the Chinese characters. In this way, accurate matching of Chinese characters can be achieved conveniently and quickly...