PHP：正则函数:

最新推荐文章于 2025-12-15 11:48:41 发布

原创最新推荐文章于 2025-12-15 11:48:41 发布 · 108 阅读

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本文详细介绍PHP中正则表达式的应用，包括字符串的匹配、查找、替换、分割与连接等操作，通过实例展示了preg_match、preg_match_all、preg_grep、preg_replace和preg_split函数的使用方法。

正则函数:
1.字符串的匹配与查找
preg_match();

preg_match匹配一次

<?php 

$str="linux and php and linux and java and html5";

$ptn='/linux/';
preg_match($ptn,$str,$arr);

echo '<pre>';
print_r($arr);
echo '</pre>';
 ?>

Array
(
    [0] => linux
)

preg_match_all();

preg_match_all逐行匹配

<?php 

$str="linux and php and linux and java and html5";

$ptn='/linux/';
preg_match_all($ptn,$str,$arr);

echo '<pre>';
print_r($arr);
echo '</pre>';
 ?>

Array
(
    [0] => Array
        (
            [0] => linux
            [1] => linux
        )

)

preg_grep();

preg_grep数组搜索

<?php 
$arr=array(
	'title1'=>'linux is very much!',
	'title2'=>'php is very much!',
	'title3'=>'java and pap is very much!',
	'title4'=>'html5 is and pxp very much!',
	'title5'=>'javascript and linux is very much!',
	'title6'=>'css3 and js and php and java is very much!'
);

$ptn='/p.p/';

$arr2=preg_grep($ptn,$arr);

echo '<pre>';
print_r($arr2);
echo '</pre>';
 ?>

Array
(
    [title2] => php is very much!
    [title3] => java and pap is very much!
    [title4] => html5 is and pxp very much!
    [title6] => css3 and js and php and java is very much!
)

2.字符串的替换
preg_replace();

<?php 
$str='linux and php and Linux';

$ptn='/linux/i';
$rep='LINUX';

echo preg_replace($ptn,$rep,$str);
 ?>

LINUX and php and LINUX

3.字符串的分割与连接
preg_split();

<?php 
$str='linux-and+php,and.Linux';

$ptn='/-|\+|,|\./';
$arr=preg_split($ptn,$str);

echo '<pre>';
print_r($arr);
echo '</pre>';
 ?>

Array
(
    [0] => linux
    [1] => and
    [2] => php
    [3] => and
    [4] => Linux
)