Regular expression(regular expression) describes a stringmatching pattern (pattern), which can be used to check whether a string contains a certain substring and match the Substring replacement or removing a substring that meets a certain condition from a certain string, etc.
Regular expressions are text patterns composed of ordinary characters (such as the characters a through z) and special characters (called "metacharacters"). A pattern describes one or more strings to match when searching for text. A regular expression acts as a template that matches a character pattern with a searched string.
Example
<?php
$str = <<< EOT
<a href="www/app/a/2QRN7v" rel="external nofollow" >
<p class="phonebg">
<img src="http://www/template9/yunqingjian/jianjie/68.jpg" >
<p class="phoneclick"></p>
<p>幸福领地</p>
</p>
</a>
<a href="www/app/a/uqARNv" rel="external nofollow" >
<p class="phonebg">
<img src="http://www/template9/yunqingjian/jianjie/69.jpg" >
<p class="phoneclick"></p>
<p>一世情长</p>
</p>
</a>
EOT;
if(preg_match_all('%<p.*?>(.*?)</p>%si', $str, $matches)) {
$arr[0][] = $matches[1];
}
if(preg_match_all('/src="([^<]*)" >/i', $str, $matches)) {
$arr[1][] = $matches[1];
}
print_r($arr);
exit;
?>The running results are as follows:
Array
(
[0] => Array
(
[0] => Array
(
[0] => 幸福领地
[1] => 一世情长
)
)
[1] => Array
(
[0] => Array
(
[0] => http://www/template9/yunqingjian/jianjie/68.jpg
[1] => http://www/template9/yunqingjian/jianjie/69.jpg
)
)
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