PHP regular expression matches specified tags in string_PHP Tutorial

Below we give a PHP regular expression matching specified label in the string implementation program code. Friends who need to learn can refer to this tutorial.

In PHP applications, regular expressions are mainly used for:

•Regular matching: Match corresponding content according to regular expressions
•Regular replacement: match content based on regular expressions and replace
•Regular segmentation: Split strings according to regular expressions

Commonly used

preg_match_all()
The preg_match_all() function is used for global matching of regular expressions. It returns the number of times the entire pattern matches successfully (possibly zero), and returns FALSE if an error occurs.

Syntax:

int preg_match_all( string pattern, string subject, array matches [, int flags ] )

Example

$str = "二 broad Ganjiakou East #tag1 #tag2 #tag3. #tag4, all sent $1234 ￥xc,cvm , ￥12,dflksjfHow #tag5.x

The code is as follows

代码如下	复制代码
#tag6.cvxcv“"; preg_match_all('/#([a-zA-Z0-9x7f-xff]+)/', $str, $mat); print_r($mat);   preg_match("/[x{00a5}x{ffe5}](d+)/u", $str, $mat); print_r($mat);

Copy code

#tag6.cvxcv"";

preg_match_all('/#([a-zA-Z0-9x7f-xff]+)/', $str, $mat);
print_r($mat);

preg_match("/[x{00a5}x{ffe5}](d+)/u", $str, $mat);

代码如下	复制代码
$str = "学习php是一件快乐的事。"; preg_match_all("/[x80-xff]+/", $str, $match); //UTF-8 使用： //preg_match_all("/[x{4e00}-x{9fa5}]+/u", $str, $match); print_r($match); ?>

print_r($mat);

Regular matching Chinese characters are slightly different depending on the page encoding:

•GBK/GB2312 encoding: [x80-xff>]+ or [xa1-xff]+
•UTF-8 encoding: [x{4e00}-x{9fa5}]+/u
Example:

print_r($match); ?>

The code is as follows	Copy code
$str = "Learning PHP is a joyful thing."; preg_match_all("/[x80-xff]+/", $str, $match); //UTF-8 usage: //preg_match_all("/[x{4e00}-x{9fa5}]+/u", $str, $match);

Additional instructions: Double-byte character encoding range 1. GBK (GB2312/GB18030) x00-xff GBK double-byte encoding range x20-x7f ASCII xa1-xff Chinese gb2312 x80-xff Chinese gbk 2. UTF-8 (Unicode)

u4e00-u9fa5 (Chinese) x3130-x318F (Korean xAC00-xD7A3 (Korean)

u0800-u4e00 (Japanese)

http://www.bkjia.com/PHPjc/631584.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/631584.htmlTechArticle Below we give a PHP regular expression matching specified label in the string implementation program code, there is need to learn Friends can refer to this tutorial. In PHP applications, regular expressions mainly...