preg_match_all找不到匹配

Question

Nothing appears to be wrong with the expression. I've matched it to the sample HTML in several editors. But once I plug it into preg_match_all, I get no results.

Any ideas?

$regex_lists = '~<ul.*?>.+?</ul>~m';
preg_match_all($regex_lists, $html, $lists);

var_dump($lists); //empty array

Sample HTML

<ul type="disc">
<br><li class="MsoNormal" style="margin: 0in 0in 10pt; line-height: normal; mso-margin-      top-alt: auto; mso-margin-bottom-alt: auto; mso-list: l0 level1 lfo1; tab-stops: list   .5in;">
<span style='font-family: "Arial","sans-serif"; font-size: 12pt; mso-fareast-font-  family: "Times New Roman";'>Maintain complete knowledge of and comply with all departmental policies/service procedures/standards. <p></p></span>
<br>
</li>
<li class="MsoNormal" style="margin: 0in 0in 10pt; line-height: normal; mso-margin-top-alt: auto; mso-margin-bottom-alt: auto; mso-list: l0 level1 lfo1; tab-stops: list .5in;">
<span style='font-family: "Arial","sans-serif"; font-size: 12pt; mso-fareast-font-  family: "Times New Roman";'>Maintain complete knowledge of correct maintenance and use of equipment. Use equipment only as intended. <p></p></span>
<br>
</li>
</ul>

Answer 1

Since your input has newlines as well you need s (DOTALL) flag to make dot match newlines:

$regex_lists = '~<ul.*?>.+?</ul>~is';

OR

$regex_lists = '~<ul[^>]*>.+?</ul>~is';

PS: Also m flag is not needed in your regex.